It is innervated by the posterior interosseous nerve (branch of the radial nerve) and artery supply is through the posterior interosseus artery. F. action of palmaris longus. 0. radial nerve. Extensor pollicis brevis (Science: anatomy, muscle) origin, dorsal surface of radius; insertion, base of proximal phalanx of thumb; action, extends and abducts the thumb; nerve supply, radial. Structure. Passing through the third tendon compartment, lying in a narrow, oblique groove on the back of the lower end of the radius, it crosses â¦ 0. Action Review Topic. The abductor pollicis brevis muscle is located in the hand between the wrist and the base of the thumb. It is one of the â¦ Extensor pollicis longus (EPL) is a long muscle located at the deep layer with extensor pollicis brevis, abductor pollicis longus, extensor indicis, and supinator muscle in the posterior compartment of the forearm. It originates from the mid-third of the ulna, and interosseous membrane then courses down to the â¦ Ulnar head: Medial border of coronoid process of ulna 2. nerve supply of extensor indicis. The flexor pollicis brevis receives its blood supply from the superficial palmar branches of radial artery. Insertion :-It inserts on the posterior aspect of base of proximal phalanx of thumb. Extensor pollicis brevis is innervated by posterior interosseous nerve which is a continuation of a deep branch of radial nerve (root value C7 and C8). Middle of the lateral aspâ¦ Humeral head: medial epicondyle of humerus 1.2. Along with extensor pollicis longus, it is responsible for extension of the thumb. Insertion: It â¦ nerve supply of extensor pollicis brevis. action of flexor carpi radialis. F, RadDev. Blood supply. Elbow flexor muscles-Biceps brachii, Brachialis, Brachioradialis, Pronator teres. Extensor Pollicis Brevis. Rerouting of the extensor pollicis longus (EPL) is the standard part of tendon transfer surgery for thumb extension. The extensor pollicis brevis descends obliquely and inserts at the base of the proximal phalanx of the first finger of the hand, known as the thumb. Relevant research. Its chief action is extension of the thumb at the metacarpophalangeal joint, abduction of carpometacarpal joint, and assists in â¦ The forearm muscles divided into-. Anterior compartment of the forearm muscles divided into superficial & deep muscles. Pronation of forearm muscles-Pronator teres & Pronator quadratus. Palmaris longus 3. Posterior surface of distal 1/3 of Radius; Interosseous Membrane; ... Extensor Pollicis Brevis. Origin: Originates from the posterior surface of the radius and interosseous membrane. Elbow extensor muscles-Triceps brachii & Anconeus, Hand muscles : Attachment, Nerve Supply & Action, Purkinje Fibers : Anatomy, Location & Function, Cerebellum : Anatomy, Location & Function, Brain Stem : Anatomy, Location & Function, Humeral head: medial epicondyle of humerus, Ulnar head: Medial border of coronoid process of ulna. In the hand, its tendon contributes to the lateral border of the anatomical snuffbox. Look it up now! In the hand, its tendon contributes to the lateral border of the anatomical snuffbox. Extensor pollicis brevis muscle View Related Images. Also, abductor pollicis brevis contracts during the early stages of opposition of the thumb; during this movement, it also acts to rotate the phalanx. Deep branch of radial nerve (C7 and C8) (C7, C8) Arterial Supply: Radial artery: Clinical conditions 1. The deep part is often innervated by the deep branch of the ulnar nerve. It is an extensor muscle located superficially at the posterior compartment of the forearm. Action Upper three- fourths of the anterior surface of the shaft ofÂ the radius, Palmar surface of the distal phalanx of the thumb, The oblique ridge on the lower one-fourth of the anterior surface of the shaft of ulna, Lower one-fourth of the anterior surface and the anterior border of the radius, Ulnar notch. Blood Supply. 4 Vascular Supply; 5 Nerve; 6 Clinical Significance; 7 See Also; 8 References; Origin. Extensor Carpi Radialis Longus and Brevis:The extensor carpi radialis muscles are situated on the lateral aspect of the posterior forearm. None ... Nerve supply. The extensor pollicis brevis muscle is located on the dorsal side of the forearm. Origin: Oblique head: bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals; Transverse head: anterior surface of body of 3rd metacarpal Insertion: Medial side of base of proximal phalanx of thumb Action: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially Innervation: Deep branch of ulnar nerve â¦ It originates from the flexor retinaculum and the tubercles of the scaphoid and trapezium bones. Choose from 416 different sets of term:= muscles hand = extensor pollicis brevis flashcards on Quizlet. Along with abductor pollicis longus it passes through the 1st extensor compartment of the wrist. Extensor pollicis longus (EPL) is a muscle of the deep compartment in the posterior compartment of the forearm.It passes through the 3 rd extensor compartment of the wrist, then continues laterally towards the thumb around Lister's tubercle. Extensor Pollicis Brevis: The extensor pollicis brevis muscle can be found medially and deep to the abductor pollicis longus muscle. - Posterior interosseous nerve: C7,8 - recurrent interosseous artery: Extensor carpi ulnaris - Extends and adducts wrist - Lateral epicondyle of humerus - Posterior border of ulna - Base of 5th metacarpal - Posterior interosseous nerve: C7,8 - Ulnar artery: Extensor pollicis brevis - Extends proximal phalanx of thumb at â¦ Extensor pollicis brevis receives its blood supply from the posterior interosseous artery and perforating branches of the anterior interosseous artery. Radial nerve (C7 and C8) Blood supply. Middle of the lateral aspect of the shaft of the radius. The main function of the extensor pollicis brevis is to extend the proximal phalanx of the thumb. Superficial muscles: Common Elbow Conditions: Tennis Elbow, Golfers Elbow & Cubital TunnelÂ Syndrome. The extensor pollicis longus crosses the radial artery with the extensor pollicis brevis and abductor pollicis longus tendons. Learn term:= muscles hand = extensor pollicis brevis with free interactive flashcards. The flexor pollicis brevis is mostly innervated by the recurrent branch of the median nerve (C5, C6, C7, C8, T1). Flexor carpi radialis 4. course: posteromedially with the axillary vessels, behind the humerus, then anteriorly towards the elbow where it divides into superficial and deep branches Muscles, vessels, nerves dissection level 13, left lateral view. The lateral surface of olecranon process of ulna, Flexes forearm at the elbow joint and rotates forearm to the midprone position from supine or prone positions, The posterior surface of the base of the 2nd metacarpal bone, The posterior surface of the base of the third metacarpal bone, Bases of middle phalanges of the 2nd-5th digits, Extends metacarpophalangeal joint of the little finger, Supination of the forearm when the elbow is extended, The posterior surface of the shaft of radius and ulna, The posterior surface of the shaft radius, The base of proximal phalanx of the thumb, Extends metacarpophalangeal joint of the thumb, The posterior surface of the shaft of ulna. Due to their position, they are able to produce abduction as well as the extension of the wrist. F. action of flexor digitorum superficialis. Posterior interosseous nerve (C7, C8). Finally, by virtue of its attachment to the tendon of extensor pollicis longus, it assists in extension of the thumb. Nerve supply â¦ Along with abductor pollicis longus it passes through the 1st extensor compartment of the wrist. Origin :-It originates from the posterior surface of distal third of radius and interosseous membrane. Flexor of distal phalanges after the flexor digitorum superficialis has flexed the middle phalanges. F, UlnarDev. The extensor pollicis longus arises from the dorsal surface of the ulna and from the interosseous membrane, next to the origins of abductor pollicis longus and extensor pollicis brevis.. Action. Posterior interosseous artery, anterior interosseous artery.