gross_anatomy_lecture_3_exam[1]

gross_anatomy_lecture_3_exam[1] - Forearm & Hand...

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Forearm Muscles of the Forearm Tendons of the forearm continue into the wrist, hand, and fingers Flexors and pronators are in the anterior compartment and are served by the median nerve o The 1 ½ exceptions are served by the ulnar nerve Extensors and supinators are in the posterior compartment and are served by the radial nerve Flexor-Pronator Muscles of the Forearm Tendons of these muscles are held in place by the palmar carpal ligament and the flexor retinaculum (aka transverse carpal ligament) which is a thickening of the antebrachial fascia Superficial group of muscles are attached proximally by a common flexor tendon to the medial epicondyle of the humerus (the common flexor origin) o Pronator teres o Flexor carpi radialis o Palmaris longus o Flexor carpi ulnaris Intermediate group = flexor digitorum superficialis Deep group o Flexor digitorum profundus o Flexor pollicis longus o Pronator quadratus 5 superficial and 1 intermediate muscle cross the elbow joint Brachioradialis is a flexor of the forearm but is located in the posterior compartment and is supplied by the radial nerve o Is a major exception Long flexors of the digits also flex the metacarpophalangeal and wrist joints o Flexor digitorum profundus = slow action o Flexor digitorum superficialis = fast action or flexion against resistance Pronator quadratus is the main pronator muscle, and is assisted by the pronator teres o Pronator quadratus also helps the interosseus membrane hold the radius and ulna together Extensor Muscles of the Forearm All innervated by the radial nerve Muscles that extend and abduct the hand at the wrist joint o Extensor carpi radialis longus o Extensor carpi radialis brevis o Extensor carpi ulnaris Muscles that extend the medial four digits o Extensor digitorum o Extensor indicis o Extensor digiti minimi Muscles that extend or abduct the thumb o Abductor pollicis longus o Extensor pollicis brevis o Extensor pollicis longus Extensor muscles are held in place in the wrist region by the extensor retinaculum
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o Covered with synovial tendon sheaths which reduce friction for the extensor tendons as they transverse the osseofibrous tunnels formed by the attachment of the extensor retinaculum to the distal radius and ulna Four superficial extensors are attached proximally by a common extensor tendon to the lateral epicondyle of the humerus o Extensor carpi radialis brevis o Extensor digitorum o Extensor digiti minimi o Extensor carpi ulnaris Two superficial extensors are proximally attached to the lateral supraepicondylar ridge of the humerus and to the adjacent lateral intermuscular septum o Brachioradialis o Extensor carpi radialis longus Four flat tendons of the extensor digitorum pass deep to the extensor retinaculum to the medial four fingers Extensor indicis tendon joins the tendons of the extensor digitorum to pas deep to the extensor retinaculum through the tendinous sheath of extensor digitorum and extensor indicis
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gross_anatomy_lecture_3_exam[1] - Forearm & Hand...

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