96 ELEMENTS OF MAMMALIAN ANATOMY 



(32) Extensor carpi radialis longus (Fig. 56); lateral supra- 

 condyloid ridge of humerus to second metacarpal; extensor of 

 hand. 



(33) Extensor carpi radialis brevis (Fig. 56) ; lateral supra- 

 condyloid ridge of humerus to third metacarpal; extensor of 

 hand. 



(34) Extensor digitorum communis (Fig. 56) ; lateral supra- 

 condyloid ridge of humerus to phalanges of second, third, fourth 

 and lifth digits; extensor of four ulnar digits. 



(35) Extensor digitorum lateralis (Fig. 55) (extensor digiti 

 quinti proprius of man) ; lateral supracondyloid ridge to dorsal 

 aspect of three or four lateral digits; extensor of three or four 

 ulnar digits. 



(36) Extensor carpi ulnaris (Fig. 55); lateral condyle of 

 humerus to lateral aspect of fifth metacarpal; extensor of fifth 

 digit; largest extensor of the forearm. 



(37) Extensor indicis {proprius) (Fig. 54) (includes ex. poUicis 

 longus); shaft of ulna to base of second phalanx of second digit; 

 extensor of second digit. 



(38) Supinator (Hgaments of elbow joint to ventral surface of 

 radius) . 



(39) Extensor brevis pollicis (Fig. 54) (ex. ossis metacarpi 

 pollicis; includes abductor longus poUicis of man) ; shaft of ulna 

 to base of first metacarpal; extensor and abductor of thumb. 



FLEXORS AND PRONATORS OF FOREARM 



(40) Pronator teres (Fig. 56) ; internal condyle of humerus to 

 cranial aspect of middle third of radius. Much of this muscle is 

 covered by those next described. 



(41) Flexor carpi radialis (Fig. 56); internal condyle of 

 humerus to palmar aspect of proximal end of second and third 

 metacarpals; slender muscle flexing the hand. 



(42) Palmaris longus (Fig. 56); internal epicondyle of 

 humerus to palmar fascia; flexor of first phalanx of each digit. 



