Muscles of the Forearm Flashcards
Which muscles are in the superficial layer of anterior forearm muscles?
Pronator teres, flexor carpi radialis, flexor digitorum superficialis, flexor carpi ulnaris, palmaris longus. They all attach to the medial epicondyle of the humerus + supercondylar ridge.
Where do the flexor cari radialis + ulnaris attach distally?
metacarpal bones on radial / ulnar side.
Which movements are permitted by the muscles of the anterior forearm?
Flexion of the elbow, flexion of wrist (and/or fingers), pronation of the forearm.
Where does the flexor digitorum superficialis attach distally?
by 2 slips to the middle phalanx of index to little finger.
Which muscles are in the deep layer of muscles in the anterior forearm?
Flexor digitorum profundus (to distal phalanx), flexor pollicis longus (to distal phalanx of thumb), pronator quadratus (distally between radius + ulna).
Which nerve innervates the muscles of the forearm?
All innervated by the median nerve EXCEPT flexor carpi ulnaris + medial 1/2 of flexor digitorum profundus which is innervated by the ulnar nerve.
Which structures hold the flexor tendons in place?
Flexor retinaculum (at wrist), and flexor sheaths (at fingers).
Which muscles are in the superficial layer of the extensor compartment of the forearm?
extensor carpi ulnaris, extensor carpi radialis (longus + brevis), extensor digitorum, extensor digiti minimi + brachioradialis (drinking muscle).
Which muscles are in the deep layer of the extensor compartment of the forearm?
Extensor indicis, extensor pollicis longus, extensor pollicis brevis, abductor pollicis longus, supinator.
Which nerve innervates the extensor forearm muscles?
Posterior interosseous nerve (branch of radial nerve).
Which structure holds in the tendons of the extensor forearm muscles?
Extensor retinaculum. Synovial sheaths permit movement deep to the retinaculum.
