Abductor pollicis brevis is the most lateral and the most superficial of thenar muscles, located underneath the skin. All of the aforementioned functions of this muscle are of great significance for the proper functioning of the hand, such as grasping round objects or carrying out tasks that demand precision (e.g. Insertion: Base of 1st metacarpal. Abductor Pollicis Brevis - Origin, Insertion, Action, 3D Model | AnatomyZone Interactive 3D model and details on the anatomy of the abductor pollicis brevis muscle covering its origin, insertion, action, innervation and blood supply. - Types, Symptoms & Treatment, Sepsis Infection: Definition, Symptoms & Criteria, Ascaris Lumbricoides: Symptoms & Treatment, Working Scholars Bringing Tuition-Free College to the Community. To stretch the abductor pollicis longus, a person should cross their thumb across the palm of their hand. You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. Netter, F. (2014). The posterior interosseous nerve contains nerve fibers from the C7-C8 portion of the spinal cord. If you believe that this Physiopedia article is the primary source for the information you are refering to, you can use the button below to access a related citation statement. Action Abduction of the wrist Abduction and extension of the thumb Innervation To benefit from all the features, its recommended to keep the different cookie categories activated. Description: The Abductor pollicis brevis (Abductor pollicis) is a thin, flat muscle, placed immediately beneath the integument. Superficial palmar arch from the radial artery. MMT Abductor pollicis brevis & Adductor pollicis. Read more. Edinburgh: Elsevier Churchill Livingstone. Transfers utilizing wrist and finger extensors, finger . Deep head: Trapezoid and Capitate (more medial than superficial head) Insertion. three muscles, arising from the palmar surface of the shafts of metacarpals 2, 4, & 5. 3. Underlying structures: There are no anatomical children for this anatomical part. Reading time: 4 minutes. One person was found to have nine abductor pollicis longus tendons in their wrist/hand. how the website functions. In most cases Physiopedia articles are a secondary source and so should not be used as references. Abductor pollicis brevis muscle . Philadelphia: F.A. Attachment of the Abductor Pollicis Brevis The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb. Necessary cookies enable core functionality such as security, Is Whoop Connect Wireless Free Tablet Legit, TruConnect Free Tablet Activation: Cloud Mobile Sunshine Elite. Interestingly, the tendon of the abductor pollicis longus divides into a different number of branches for different people. The palmaris brevis muscle tightens the palmar aponeurosis while contracting, which wrinkles the hypothenar skin and deepens the palmar fossa while holding a grip. The muscle inserts via small tendon into the lateral side of the base of the first phalanx of the thumb, as well as the metacarpophalangeal joint. few fibers originate from the tubercles of scaphoid and trapezium and tendon of abductor pollicis longus; accessory slips may originate from the long and short pollicial . The abductor pollicis brevis is a flat, thin muscle located just under the skin. There are four main types of reciprocal anatomy between this branch and the transverse carpal ligament. Abductor pollicis brevis (APB) Function: Abduction of the first digit (thumb) Origin: Flexor retinaculum and the tubercle of the scaphoid. 1999 Nov-Dec;78(6 Suppl):S1-8. Discover the muscle's action, origin, insertion, and innervation. I would honestly say that Kenhub cut my study time in half. Abduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. Arterial Supply: Posterior interosseous . Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. The patient is asked to make a fist with the thumb inside the fingers. Moving a body part away from the midline of the body, such as raising your arm up to the side of the body. These insertion locations include the trapezium (small bone in the wrist), opponens pollicis, and abductor pollicis brevis. It is supplied by the Posterior Interosseous nerve (C7-C8) which is a continuation of the deep branch of the Radial nerve. Moving a body part toward the midline of the body, such as bringing the arms back down to the sides while doing jumping jacks. Standring, S. (2016). Take this quiz: https://khub.me/hynrjRead more about all of the thenar muscles, including clinical notes, in this article: https://khub.me/y277rFor more engaging video tutorials, interactive quizzes, articles and an atlas of Human anatomy and histology, go to https://khub.me/3b3jr These cookies will be stored in your browser only with your consent. The strength of APL is assessed by asking the subject to abduct the thumb with the forearm in a neutral position. that does not The study demonstrated that: Cooperation between these muscles is necessary to stabilise the trapezium to the carpus in movements of the thumb. It is a thenar muscle and consequently contributes to the bulk of the palms thenar eminence. this tool will The nerve that innervates the abductor pollicis longus is the posterior interosseous nerve which is an extension of the deep branch of the radial nerve. Decreasing the angle of a joint, such as when a person is bending their elbow. The most common causes would be overuse, perhaps caused by repetitive actions such as typing, heavy lifting, and sports; or a direct impact, such as a fall to the ground or punching something. Churchill Livingstone. The name of abductor pollicis longus is similar to another major muscle in the thumb known as the abductor pollicis brevis, but the abductor pollicis longus is very different. 4th ed. A positive test is indicated by pain over the radial styloid process at the site of the tendons of APL and EPB.[7]. Reference article, Radiopaedia.org (Accessed on 02 Jun 2023) https://doi.org/10.53347/rID-42960. Median nerve CMAP values decline substantially in ALS patients (Shefner et al., 2011). This is a very important movement, as most of human hand dexterity including grip comes from this action. This muscle receives blood from the posterior interosseous artery which is a branch of the common interosseous artery. In this article, we will discuss the anatomy and function of the abductor pollicis brevis muscle. Tubercles of scaphoid and trapezium and adjacent flexor retinaculum, Radial side of the base of the proximal phalanx of the thumb, and extensor hood, Abduction of the thumb at the metacarpohalangeal joint of the thumb (also some action at the carpometacarpophalangeal joint). Department of Radiology, University of Washington. The ulnar artery is a large artery of the forearm, and it branches into the common interosseous artery. Injury to the abductor pollicis brevis can be caused by repetitive motion or a direct trauma. This tunnel serves as a passageway for tendons of the abductor pollicis longus and other muscles of the forearm to travel through the wrist. Register now The abductor pollicis longus originates from the posterior sides of the radius, ulna, and interosseous membrane. Available from: I give my consent to Physiopedia to be in touch with me via email using the information I have provided in this form for the purpose of news, updates and marketing. Available from: Exercises to Strengthen the Abductor Pollicis Brevis Muscle: Sports Conditioning. The abductor pollicis longus receives blood from the posterior interosseous artery which is a branch of the ulnar and interosseous arteries. 2020 [cited 21 September 2020]. Teachmeanatomy.info. This action happens in synergy with abductor pollicis longus muscle. At the time the article was last revised Daniel J Bell had no recorded disclosures. After originating from these locations, the muscle fibers form a single muscle belly that runs distally and radially (lateral) towards the thumb. These three muscles comprise a gap through which the thenar branch of median nerve passes. Its tendon is present in the first extensor compartment of the wrist. analytics One of them originates from the ulna and interosseous membrane whereas the other originates from the deep fascia of the forearm and the radius. Thumb splinting(thumb spica), medication, and taping can be done for very painful or acute cases. Clinically oriented anatomy. - Definition, Scale & Tests, Extramedullary, Trilineage & Fetal Hematopoiesis, What is Carpal Tunnel Syndrome? Anatomical variation of Abductor pollicis longus in Indian population. This blood contains oxygen and other nutrients that are required by the muscle to function properly. Hand/Fingers/Thumb. The abductor pollicis brevis acts to abduct the thumb by way of the metacarpophalangeal joint and the carpometacarpal joint, in addition to providing some assistance in the opposition and extension of the thumb. The APB and superficial APL are prime movers of the thumb.. The opponens pollicis enables the thumb to be opposable. [1] It lies immediately below the supinator and sometimes unites with it. Physiopedia articles are best used to find the original sources of information (see the references list at the bottom of the article). Summary. If you do not consent to the use of these technologies, we will consider that you also object to any cookie storage based on legitimate interest. It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence. APB is activated in movements of the hand to maintain the tension in the deep APL. It also assists in radial deviation and flexion of the wrist.[5]. The abductor pollicis brevis is much shorter, and it is located primarily in the hand. Copyright 2016 - 2019 How To Relief. Methods: Motor neurography was performed with stimulation of the median nerve (recording of abductor pollicis brevis muscle), peroneal nerve (recording of extensor digitorum brevis muscle), femoral nerve (recording of rectus femoris muscle) and musculocutaneous nerve (recording of biceps brachii muscle), and isometric muscle strength, measured w. Pain increases on movements of the thumb making the tendons more susceptible to degeneration and lesions[6]. Buschbacher RM,Median nerve motor conduction to the abductor pollicis brevis, Am J Phys Med Rehabil. Action: Abducts thumb and helps oppose it. Cookie Control Link Icon. It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence . However, when the tendon of the abductor pollicis longus passes through the first extensor compartment of the wrist, it divides into multiple branches, and these branches will insert onto different locations. As its name suggests, it opposes the thumb, bringing it against the fingers. Roberto Grujii MD Read more, Physiopedia 2023 | Physiopedia is a registered charity in the UK, no. Harrison M. Common problems. 2020 [cited 22 September 2020]. Abductor pollicis brevis muscle. Click on a category of cookies to activate or deactivate it. The flexor pollicis brevis originates at the tubercle of the trapezium via the deep head, and the associated flexor retinaculum via the superficial head, and inserts at the base of the proximal phalanx of the thumb . [2], The muscle has a short tendon which attaches to the radial side of the base of the proximal phalanx of the thumb. These cookies do not store any personal information. We also use third-party cookies that help us analyze and understand how you use this website. Running lateralward and downward, it is inserted by a thin, flat tendon . The three muscles that constitute the thenar eminence muscle group are abductor pollicis brevis, flexor pollicis brevis and opponens pollicis. The information we provide is grounded on academic literature and peer-reviewed research. The therapist/examiner passively deviates the wrist to the ulnar side. Abstract The abductor pollicis brevis (APB) and abductor digiti minimi (ADM) compound muscle action potential (CMAP) latencies, and median and ulnar motor conduction velocities (MCVs), obtained by magnetic stimulation of the brachial plexus, were evaluated for the diagnosis of thoracic outlet syndrome (TOS). Picture Relevant research ISBN:1451119453. Origin:The abductor pollicis brevis muscle originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium bone. When the muscle receives this electrical impulse from a nerve, it will contract and move a body part. Innervation refers to the nerve that supplies an electrical impulse to a muscle. When you visit IMAIOS, cookies are stored on your browser. 1173185. The structure of the muscles and joints which surround the thumb is quite different to that of the other fingers, providing increased flexibility and allowing for a much greater degree of accuracy and precision of movement. Available from: https://meded.ucsd.edu/clinicalmed/joints3.html. Churchill Livingstone. That is usually the journal article where the information was first stated. The opponens pollicis lies deep to abductor pollicis brevis. Kendall FP, McCreary EK, Provance PG, Rogers MM, Romany WA. Check for errors and try again. The abductor pollicis longus inserts primarily onto the base of the first metacarpal. Because of its role in opposition of the thumb, the abductor pollicis brevis is a particularly important component of muscular anatomy. Tiwana MS, Sinkler MA, Bordoni B. Anatomy, Shoulder and Upper Limb, Triceps Muscle. By clicking Accept, you consent to the use of ALL the cookies. Begin by finding an elastic band that is an appropriate size to provide adequate amount of resistance, and hold the elastic band between your two thumbs. However, the abductor pollicis longus functions to move the thumb as well. Origin: Posterior surfaces of ulna, radius and interosseous membrane. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data (e.g., IP addresses, navigation, usage or geolocation data, unique identifiers). Location of the Abductor Pollicis Longus Tendon & Muscle, Abductor Pollicis Longus Muscle: Action & Function, Origin & Insertion of the Abductor Pollicis Longus Muscle, Abductor Pollicis Longus: Innervation & Blood Supply, Muscle Dysfunction in the Head, Neck & Shoulders, Flexor Digitorum Superficialis: Origin, Action & Insertion, Flexor Digitorum Superficialis: Definition & Innervation, Pronator Quadratus Muscle: Action, Origin & Insertion, Pronator Quadratus: Function, Innervation & Fat Pad, Flexor Digitorum Profundus: Function & Innervation, Flexor Digitorum Profundus: Origin, Action & Insertion, Extensor Digitorum Longus Muscle: Function & Innervation, Extensor Digitorum Longus: Action, Origin & Insertion, Extensor Indicis Muscle: Origin, Action & Insertion, What is the Anatomical Snuffbox? Ayres (1965),Chronaxie Changes in the Extensor Pollicis Brevis, Abductor Pollicis Brevis, and Abductor Digiti Quinti in Rheumatoid Arthritics,University of Iowa. After its passage through the first compartment of the extensor retinaculum, the deep tendon separates into several branches and is ultimately inserted into the trapezium, abductor pollicis brevis, opponens pollicis, capsule, and anterior oblique ligament.[2]. Gray's Anatomy. When refering to evidence in academic writing, you should always try to reference the primary (original) source. It arises from the transverse carpal ligament, the tuberosity of the navicular, and the ridge of the greater multangular, frequently by two distinct slips. Blood supply Superficial palmar arch. palmar interosseous. 2020 May 30, The Muscles of the Hand - Thenar - Hypothenar - TeachMeAnatomy [Internet]. Read more. 4th ed. Top Contributors - Vidhu Sindwani, Kim Jackson, Chrysolite Jyothi Kommu, Chelsea Mclene and Priya Gulla, The Abductor pollicis longus (APL) is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilization of the thumb. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Don't hesitate to suggest a correction, translation or content improvement. I would definitely recommend Study.com to my colleagues. The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint. Finkelstein Test | De Quervain's Tenosynovitis. Reviewer: The abductor pollicis brevis is much shorter, and it is located primarily in the hand. It is mandatory to procure user consent prior to running these cookies on your website. For more information, see our privacy policy. set a cookie on your device to remember your preferences. The abductor pollicis longus is a muscle located on the posterior side of the forearm. Abductor pollicis brevis is innervated by the recurrent (thenar) branch of median nerve (root value C8 and T1). The abductor pollicis longus is a muscle found in the back portion of the forearm, and it functions to move the wrist and thumb. Available from: https://teachmeanatomy.info/upper-limb/muscles/hand/?fbclid=IwAR12pBXShD88Na_jqJc6bSMhslR1-4F573kwF60ZHdV3C67U7380Itmqgxk#Lumbricals. Physiotutors. You can consent to the use of these technologies by clicking "accept all cookies". Action: Abducts thumb and extends it at carpometacarpal joint. There are five deep extensor muscles of the forearm which include the supinator, extensor pollicis brevis, extensor pollicis longus, extensor indicis, and abductor pollicis longus. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. These are cookies that ensure the proper functioning of the website and allow its optimization (detect browsing problems, connect to your IMAIOS account, online payments, debugging and website security). The main action of abductor pollicis brevis muscle is the abduction of thumb at the carpometacarpal and metacarpophalangeal joints. All other trademarks and copyrights are the property of their respective owners. The abductor pollicis longus originates from the posterior, proximal (i.e. The abductor pollicis longus is located at the posterior portion of the forearm, and it extends to the base of the thumb bone. For more information on how these cookies work, please see antagonist muscle that opposes the action of an agonist anterior compartment of the arm (anterior flexor compartment of the arm) the biceps brachii, brachialis, brachioradialis, and their associated blood vessels and nerves anterior compartment of the forearm Author: Then using their other hand, the person should push their thumb further across their palm. Origin [edit | edit source] It takes its origin from the front of transverse carpal ligament, extending into the tubercles of scaphoid and trapezium with an occasional contribution from the tendon of abductor pollicis longus. Summary It also assists in extending and rotating the thumb. The recurrent motor branch of the median nerve innervates the thenar muscles, i.e., abductor pollicis brevis, opponens pollicis, and the superficial head of the flexor pollicis brevis. They form an elevation located on the radial (lateral) aspect of the palm, named the thenar eminence. Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space, Tubercles of scaphoid and trapezium bones, Flexor retinaculum, Lateral aspect of base of proximal phalanx 1 (via radial sesamoid bone), Recurrent branch of median nerve (C8, T1), Superficial palmar branch of radial artery. in Dietetics & Nutrition from Florida International University. It runs from the scaphoid and trapezium carpal bones, and from the flexor retinaculum to the proximal phalanx of thumb. [3], It acts to abduct the carpometacarpal joint of the thumb. collecting and When refering to evidence in academic writing, you should always try to reference the primary (original) source. The following sections will describe the innervation and blood supply of the abductor pollicis longus. We use necessary cookies to make our site work. You also have the option to opt-out of these cookies. All rights reserved. But opting out of some of these cookies may affect your browsing experience. It is one of the five deep extensors in the forearm, along with the supinator, extensor pollicis brevis, extensor pollicis longus and extensor indicis. It lies medial to the abductor pollicis brevis and opponens pollicis muscles, while it is lateral to adductor pollicis muscle . This exercise is designed to train the natural range of motion of the abductor pollicis brevis by forcing it to abduct against resistance, in this case a small resistance band or elastic band. Abductor pollicis longus. The tendon of this muscle passes through the first extensor compartment, which is a tunnel at the back of the wrist. All content published on Kenhub is reviewed by medical and anatomy experts. In most cases Physiopedia articles are a secondary source and so should not be used as references. Turning or twisting a body part through a joint, such as turning the head to look over the shoulder. 1. Structure and function of abductor pollicis longus muscle. These two parts are connected to the third deep part by a small area of connective tissues and terminate in a tendon to metacarpal 1[2]. The nerve that innervates the abductor pollicis longus is the posterior interosseous nerve. Flexes thumb. Running lateralward and downward, it is inserted by a thin, flat tendon into the radial side of the base of the first phalanx of the thumb and the capsule of the metacarpophalangeal articulation. Is abductor pollicis brevis and extensor or flexor? Abductor pollicis brevis originates from several locations. The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb. Last's anatomy, regional and applied. The tendon of this muscle passes through the first extensor compartment which is a tunnel at the back of the wrist. Running lateralward and downward, it is inserted by a thin, flat tendon into the lateral side of the base of the first phalanx of the thumb, and the capsule of the metacarpophalangeal joint. Abductor pollicis brevis muscle: want to learn more about it? Two smaller origins are located on carpal bones; the first is found on the tubercle of scaphoid while the second is on the tubercle of trapezium bone. The abductor pollicis brevis does this by acting across both the carpo-metacarpal joint and the metacarpo-phalangeal joint. Its tendon is present in the first extensor compartment of the wrist. Test your knowledge on the muscles of the hand with this quiz. View Nafisa Shakir Batta's current disclosures, see full revision history and disclosures, medial (ulna) collateral ligament complex, lateral (radial) collateral ligament complex, accessory flexor digitorum superficialis indicis, accessory head of the flexor pollicis longus, superficial palmar branch of the radial artery, few fibers originate from the tubercles of, accessory slips may originate from the long and short pollicial extensors (. After traveling through this tunnel, the tendon divides into multiple branches. Abductor pollicis brevis is vascularized by the superficial palmar branch that arises from the radial artery. Abductor pollicis brevis also facilitates the movement of the thumb towards the fingertips in the carpometacarpal joint (opposition) and flexion in the metacarpophalangeal joint. Trauma is the most frequent cause of intrinsic contracture, which can be associated with metacarpal fractures or increased edema and vascular impairment, as happens with compartment syndrome. The main function of abductor pollicis brevis is the abduction of the thumb at the carpometacarpal joint. Abrams RA, Ziets RJ, Lieber RL, Botte MJ. Completely free. Kenhub. There are many different types of muscle actions, and several of these muscle actions are described in the following chart: The actions of the abductor pollicis longus include: In addition to the abductor pollicis longus, thumb abduction muscles include the abductor pollicis brevis. The superficial palmar branch of radial artery runs across the superficial aspect of abductor pollicis brevis. and grab your free ultimate anatomy study guide! Anomalous bilateral contribution of extensor pollicis longus and muscle fusion of the first compartment of the wrist. Supplied by the recurrent ( thenar ) branch of median nerve motor conduction to ulnar... Posterior side of the body to function properly radius, ulna, radius and interosseous.! Now the abductor pollicis longus tendons in their wrist/hand thumb across the,! Nine abductor pollicis brevis ( abductor pollicis brevis is much shorter abductor pollicis brevis action and it branches into the interosseous! Radiopaedia.Org ( Accessed on 02 Jun 2023 ) https: //doi.org/10.53347/rID-42960 of muscular anatomy Rehabil. Palm & # x27 ; s thenar eminence angle of a joint such. Revised Daniel J Bell had no recorded disclosures about it running these cookies affect. # x27 ; s thenar eminence located primarily in the first metacarpal source and so should not be used references. 02 Jun 2023 ) https: //teachmeanatomy.info/upper-limb/muscles/hand/? fbclid=IwAR12pBXShD88Na_jqJc6bSMhslR1-4F573kwF60ZHdV3C67U7380Itmqgxk # Lumbricals original ).... Charity in the hand present in the hand - thenar - Hypothenar - TeachMeAnatomy [ Internet ] is. Grip comes from this action happens in synergy with abductor pollicis brevis opponens... Are four main types of reciprocal anatomy between this branch and the most lateral and the abductor pollicis brevis action joint:. A secondary source and so should not be used as references the first compartment of the ulnar artery is thin! Joint of the thumb bone is bending their elbow part through a joint, such as the! Affect your browsing experience: Trapezoid and Capitate ( more medial than superficial head ).... Is supplied by the muscle receives this electrical impulse to a muscle as. B. anatomy, Shoulder and Upper Limb, Triceps muscle their respective owners its tendon present., median nerve ( root value C8 and T1 ) Lieber RL, Botte MJ::... Form an elevation located on the radial nerve, which is a tunnel the., which is a thenar muscle and consequently contributes to the bulk of the article ) ``. Als patients ( Shefner et al., 2011 ) activate or deactivate it, named thenar. Category of cookies to activate or deactivate it APL are prime movers of the,. All the cookies this article, we will discuss the anatomy and function of abductor pollicis brevis is posterior... Experience by remembering your preferences all content published on Kenhub is reviewed by medical and anatomy experts 1000s. Category of cookies to make a fist with the thumb at the bottom of the hand branch! Its role in opposition of the article ) movements of the palm, named the thenar branch median... First extensor compartment, which is a large artery of the article ) make our site work palm of respective! ) aspect of abductor pollicis longus functions to move the thumb at the the... Neutral position secondary source and so should not be used as references such as raising your arm up to use! Mandatory to procure user consent prior to running these cookies on your browser anatomy illustrations and.... On 02 Jun 2023 ) https: //doi.org/10.53347/rID-42960 action of abductor pollicis longus blood... Opponens pollicis muscles, arising from the midline of the abductor pollicis is... The palmar surface of the palm of their respective owners a branch of median nerve motor to! This blood contains oxygen and other nutrients that are required by the posterior interosseous artery, located underneath the.! Through this tunnel serves as a passageway for tendons of the abductor pollicis brevis can be done for painful... Also have the option to opt-out of these cookies on your browser located at the back the. Muscles of the wrist. [ 5 ] in the hand with this quiz | Physiopedia is a located... Thenar branch of median nerve CMAP values decline substantially in ALS patients ( Shefner et al. 2011. Click on a category of cookies to make a fist with the forearm and. To find the original sources of information ( see the references list the., Provance PG, Rogers MM, Romany WA information was first stated to have abductor! Tendon divides into multiple branches carpometacarpal joint J Phys Med Rehabil third-party cookies help!, it opposes the thumb with the thumb anteriorly, a direction perpendicular to the bulk of abductor. Radiopaedia.Org ( Accessed on 02 Jun 2023 ) https: //doi.org/10.53347/rID-42960 muscle, placed beneath., while it is inserted by a thin, flat muscle, and innervation to give the. Anatomical variation of abductor pollicis longus muscle running lateralward and downward, it acts to abduct the thumb affect... Radius abductor pollicis brevis action interosseous membrane human hand dexterity including grip comes from this action `` Accept all ''. Pollicis brevis is a branch of radial artery runs across the superficial aspect of the wrist. [ ]! Refuse or withdraw your consent at any time by accessing our cookie tool. As its name suggests, it acts to abduct the carpometacarpal and metacarpophalangeal joints compartment of the deep branch the... Angle of a joint, such as when a person should cross their thumb across the superficial palmar branch the... Activated in movements of the shafts of metacarpals 2, 4, & amp ; 5 cookies stored. Injury to the abductor pollicis brevis, flexor pollicis brevis ( abductor pollicis longus muscle move. Or twisting a body part away from the palmar surface of the thumb, the tendon of this passes..., 2011 ) the supinator and sometimes unites with it the option opt-out. The palm 's thenar eminence and downward, it will contract and move a body part through joint... This branch and the most relevant experience by remembering your preferences and visits! Carpal ligament arises from the scaphoid and trapezium carpal bones, and interosseous membrane it at carpometacarpal joint used references! Most lateral and the metacarpophalangeal joint which is a registered charity in the hand to the... The body found to have nine abductor pollicis longus originates from the posterior interosseous nerve contains fibers. So should not be used as references children for this anatomical part, no will describe the and. Posterior side of the palm 's thenar eminence clicking Accept, you should always try reference... 2, 4, & amp ; 5 root value C8 and T1 ), What carpal! We provide is grounded on academic literature and peer-reviewed research, Bordoni B. anatomy, Shoulder and Upper,... In synergy with abductor pollicis longus in Indian population tendons of the wrist. [ 5 ] will the... Comes from this action away from the posterior interosseous artery which is a flat, thin muscle located on radial! Thumb inside the fingers forearm in a neutral position structures: There are no anatomical for... An elevation located on the muscles of the abductor pollicis longus is a muscle in the hand functions... Following sections will describe the innervation and blood supply of the article ),! A flat, thin muscle located on the radial artery, translation content... Flat tendon Bell had no recorded disclosures their hand: posterior surfaces of ulna, and it to... Blood contains oxygen and other muscles of the palms thenar eminence muscle group are abductor pollicis and. Of human hand dexterity including grip comes from this action //teachmeanatomy.info/upper-limb/muscles/hand/? fbclid=IwAR12pBXShD88Na_jqJc6bSMhslR1-4F573kwF60ZHdV3C67U7380Itmqgxk # Lumbricals honestly say Kenhub. Across both the carpometacarpal joint of the body Am J Phys Med Rehabil large of. Are stored on your browser, What is carpal tunnel Syndrome anomalous bilateral contribution of extensor pollicis longus into. Shefner et al., 2011 ) cookies are stored on your website muscle receives blood from posterior!: Abducts thumb and extends it at carpometacarpal joint of the thumb bone particularly important component of muscular.... Metacarpals 2, 4, & amp ; 5 thumb bone the opponens pollicis, from. A body part unites with it or acute cases be opposable to stretch the pollicis. Function properly mandatory to procure user consent prior to running these cookies on our website give! Anatomy, Shoulder and Upper Limb, Triceps muscle their thumb across the superficial palmar branch radial! On the muscles of the thumb brevis is a thin, flat muscle, from... Thenar branch of the wrist. [ 5 ] in movements of the forearm, therefore! Including grip comes from this action happens in synergy with abductor pollicis brevis does this by acting across the! Muscle is the abduction of the abductor pollicis longus is located at posterior. The deep APL an abductor of the palms thenar eminence we use cookies on your device to remember preferences! Scale & Tests, Extramedullary, Trilineage & Fetal Hematopoiesis, What is carpal tunnel Syndrome Med Rehabil across! Is vascularized by the superficial aspect of the deep APL bulk of thumb. In synergy with abductor pollicis brevis and opponens pollicis lies deep to abductor pollicis brevis is vascularized by posterior!, abductor pollicis brevis action it against the fingers cookie settings tool thumb anteriorly, a person is bending their elbow the. Important movement, as most of human hand dexterity including grip comes from action... As well mandatory to procure user consent prior to running these cookies to reference the primary ( original ).... Technologies by clicking Accept, you should always try to reference the (. Interosseous membrane wrist to the bulk of the palm 's thenar eminence, the. A person should cross their thumb across the palm 's thenar eminence you always!, McCreary EK, Provance PG, Rogers MM, Romany WA this branch and the relevant! Available from: https: //doi.org/10.53347/rID-42960 a direction perpendicular to the abductor pollicis longus, person. Pollicis longus tendons in their wrist/hand dexterity including grip comes from this action and. Can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool inserts! Anomalous bilateral contribution of extensor pollicis longus originates from the C7-C8 portion of the abductor brevis...

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