MYOLOGY 109 



of the internal condyle of the humerus, passing through the humero- 

 ulnar puUey at the side of the base of the olecranon process; the 

 other, to the posterior of the internal condyle of the humerus. It 

 does not pass through a puUey. 



Insertion. — ^A subcylindrical tendon extends back of the ulnare 

 ossicle of the carpus giving off a tendinous sUp to the flexor digi- 

 torum profundus, and becomes inserted to the anterior rim of the 

 proximal phalanx of the index digit. It has an attachment at 

 the carpus. 



Shape. — A strong fleshy beUy terminating in a long tendon. 



Relations. — The outermost inferior muscle of the forearm. 



Action.- — A powerful flexor of the hand upon the forearm. 



Flexor Carpi Ulnaris Brevier (Fig. 13, No. 20). Location. — 

 Inferior part of the antibrachial region. 



Origin. — From a broad area on the middle third of the upper side 

 of the shaft of the ulna. 



Insertion. — Near the top of the outer edge of the anchylosed 

 OS magnum of the carpo-metacarpus. 



Shape. — Thin, somewhat flat. 



Relations. — To the inside of the flexor digitorum profundus. 



Action. — Flexes the hand upon the forearm and rotates the hand 

 toward the body. 



OTHER MUSCLES OF THE DIGITS 



Extensor proprius poUicis Flexpr brevis polhcis 



Flexor minimi digiti Flexor minimi digiti brevis 



Abductor minimi digiti Interosseous dorsalis 



Interosseous pahnaris Flexor metacarpi brevis 



Extensor Proprius Pollicis (Fig. 13, No. 29a). Location. — ^An- 

 terior to the radio-carpal joint. 



Origin. — From the ulnar side of the tendon of the extensor meta- 

 carpi radiahs longior. 



Insertion. — ^To the antero-uhiar side of the pollex: 



Shape. — Small, spindle-shaped; tendinous at both attachments. 



Relations. — Inferiorly, with the proximal and anterior part of the 

 metacarpus. 



Action. — An extensor of the poUex. 



Flexor Brevis Pollicis (Fig. 13, No. 28a). Location. — ^Anterior to 

 the pollex. 



