THE MUSCLES. 295 



of the humerus and from the coronoid process of the ulna, 

 and proceeds obliquely across to the outer side of the radius. 



T.\\t flexor carpi radialis arises from the inner condyle and 

 is inserted by a tendon into the second metacarpal. 



The palmaris longits also springs from the inner condyle, 

 and ends in a fibrous expansion in the palm of the hand. 



The flexor carpi ulnaris arises partly from the same con- 

 dyle, partly from the olecranon (the ulnar nerve passing 

 between these origins). It is inserted by tendon into the 

 pisiform bone and the fifth metacarpal. 



"\& flexor sublimis digitorum is (as its name implies) the 

 superficial bender of the fingers. It takes origin from the 

 inner condyle, the coronoid process of the ulna, and part of 

 the front surface of the radius. It divides near the wrist into 

 four tendons, which go respectively to the second phalanx of 

 each of the four digits. Each tendon splits (before it is 

 inserted) to allow a tendon of the deep flexor tendon to pass 

 through it whence the superficial flexor is also called the 

 perforates* 



The flexor profundus digitorum or perforans arises from 

 the ulna and from the membrane connecting that bone with 

 the radius. Above the wrist it gives rise to four tendons 

 which are respectively inserted into the disf 1 phalanges of 

 the four fingers, each tendon passing through trie split before 

 mentioned as existing in each tendon of the perforated flexor. 



The lumbricales are small worm-like muscles (whence their 

 name) which arise, in the hand, from the deep flexor 

 tendons on their radial side, and are inserted into the same 

 side of the respective four fingers. 



Flexor longus pollicis is the name of a muscle which 

 arising from the fore part of the radius and being inserted 

 by a long tendon into the last phalanx of the pollex bends 

 the thumb. 



Pronator quaaratus. A short muscle thus named extends 

 across from the radius to the ulna towards their distal ends. 



Supinator longus. A muscle which antagonises the pro- 

 nators, springs from above the external condyle of the 

 humerus and is inserted into the outer border of the distal 

 end of the radius. 



The extensores carpi radialis longior and brevier are two 

 muscles which arise, one over the other, from above the 

 external condyle of the humerus, and end each in a tendon ; 

 the first being inserted into the second metacarpal, and the 

 second tendon into the middle metacarpal. 



