MYOLOGY. 71 



LATERAL EXTENSOR OF PHLANGES. 



Origin. — Outer side of superior tuberosity of radius ; from con- 

 tiguous sides of radius and ulna and external lateral ligament. 

 Insertion — Anterior surface of superior portion of first phalanx. 

 Action. — As preceding. 

 Nerve. — Radial. 



EXTERNAL FLEXOR OF METACARPUS. 



Origin. — External condyle of humerus. 



Insertion. — Supercarpal and external metacarpal bones. 



Action. — Flexes foot. 



Nerve. — Radial. 



OBLIQUE FLEXOR OF METACARPUS. 



Origin. — Base of epitrochlea and olecranon. 

 Insertion. — On supercarpal with preceding. 

 Action. — As preceding. 

 Nerve. — Ulnar. 



INTERNAL FLEXOR OF METACARPUS. 



Origin. — Epitrochlea with preceding. 

 Insertion. — Head of internal metacarpal bone. 

 Action. — Same as external flexor. 

 Nerve. — Radial. 



FLEXOR SUBLIMIS DIGILORUM OR PERFORATUS. 



Origin. — Summit of epitrochlea. 



Insertion. — By two divisions into superior extremity of second 

 phalanx ; between the two divisions passes the perforans tendon. 

 It also passes through the carpal sheath, a reflexion of strong 

 fibres running from the first to the fourth carpal bones. 



Action. — Flexes second phalanx and also whole foot. 



Nerve. — Ulnar. 



FLEXOR PROFUNDUS DIGITORUM OR PERFORANS. 



Origin. — Summit of epitrochlea, summit and posterior border 

 of olecranon and posterior surface of radius. 



Insertion. — Passes through carpal sheath, between two heads 



