extensor pollicis brevis innervation
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Palastanga, N., & Soames, R. (2012). The tendon passes deep to extensor retinaculum, between the tendons of abductor pollicis longus and extensor carpi radialis longus. After passing under the retinaculum, the tendon runs laterally to insert onto the dorsal surface of the base of the proximal phalanx of thumb. Extensor pollicis brevis muscle (Musculus extensor pollicis brevis) - Yousun Koh. Register now Functional anatomy: Musculoskeletal anatomy, kinesiology, and palpation for manual therapists. Tendons of forefinger and vincula tendina. Origin: Posterior surfaces of radius and interosseous membrane. The extensor pollicis brevis is innervated by the radial nerve. Arteries of the back of the forearm and hand. Atlas of Human Anatomy (6th ed.). It is connected with the extensor pollicis longus … Innervation. Kim Bengochea, Regis University, Denver, Author: Netter, F. (2014). Absence; fusion of tendon with that of the extensor pollicis longus or abductor pollicis longus muscle. Relevant Anatomy: Extensor pollicis brevis is located in the first extensor/dorsal compartment and has the most distal muscle bell in the first extensor compartment. ACTION. The tendon of extensor pollicis longus and the styloid process of radius make the medial and proximal borders of this space, respectively. Extension of the thumb at the carpometacarpal and metacarpophalangeal joint, Weak wrist extension, Wrist abduction Extensor pollicis brevis - Innervation Radial nerve (C6, C7) Extensor pollicis brevis muscle: want to learn more about it? Extensor Pollicis Brevis: The extensor pollicis brevis muscle can be found medially and deep to the abductor pollicis longus muscle. Extensor pollicis brevis receives its blood supply from the posterior interosseous artery and perforating branches of the anterior interosseous artery. Just above the wrist, extensor pollicis brevis obliquely crosses the tendons of extensor carpi radialis brevis and extensor carpi radialis longus muscles. The main action of this muscle is to extend the thumb on the carpometacarpal and metacarpophalangeal joints, together with its long counterpart, extensor pollicis longus muscle. In human anatomy, the extensor pollicis brevis is a skeletal muscle on the dorsal side of the forearm. (Extensor pollicis brevis labeled at upper left. Extensor pollicis brevis is a deep extensor of the thumb that lies deep to extensor digitorum muscle. 2020 (Extensor pollicis brevis visible at left. De korte duimstrekspier werkt samen met de lange duimstrekker (musculus extensor pollicis longus) waarbij de lange duimstrekspier aan het distale duimkootje aangehecht is. INSERTION. Last reviewed: October 29, 2020 Ventricles, meninges and blood vessels of the brain, Posterior surface of distal third of radius and interosseus membrane, Posterior aspect of base of proximal phalanx of thumb, Carpometacarpal and metacarpophalangeal joint 1: Thumb extension, Posterior interosseous artery, anterior interosseous artery. Along with abductor pollicis longus, it is located in the first extensor (dorsal) compartment of the wrist. It lies on the medial side of, and is closely connected with, the abductor pollicis longus. The extensor pollicis brevis is innervated by the radial nerve. All rights reserved. Extensor Pollicis Brevis. It also extends the thumb in the carpometacarpal joint of the thumb. Together with the tendon of abductor pollicis longus, the tendon of extensor pollicis brevis comprises the lateral border of a triangular depression on the lateral aspect of the wrist, called the anatomical snuffbox. Its direction is similar to that of the abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb. Reviewer: This is an important clinical point since it is the most common spot for the palpation of the radial pulse. Cael, C. (2010). From here, the muscle runs downwards towards the wrist, ending in a cord-like tendon proximally to the wrist. The main function of the extensor pollicis brevis is to extend the proximal phalanx of the thumb. Insertion: It attaches to the base of the proximal phalanx of the […] The origin area extends to the adjacent interosseous membrane. 0. Extensor pollicis brevis (EPB) is one of the muscles of the deep layer of the posterior compartment of the forearm, inserting into the base of the proximal phalynx of the thumb.Along with extensor pollicis longus, it is responsible for extension of the thumb.Along with abductor pollicis longus it passes through the 1 st extensor compartment of the wrist. Gray's Anatomy (41tst ed.). Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Deep muscles. Extensor digitorum is innervated by posterior interosseous nerve which is a continuation of a deep branch of radial nerve (root value C7 and C8).
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