THE MUSCLES OF THE UPPER EXTREMITY. 127 



base of the pollex digit ; after wliicli, it continues down 

 the anterior aspect of the shaft of the carpo-metacarpus 

 in a well-marked and somewhat oblique groove intended 

 for it, as far as the upper end of the proximal phalanx 

 of the middle digit. Here it lies beneath the tendons 

 of the other muscles, when turning to the median line 

 through a fibro- cartilaginous pulley intended for it, it is 

 finally inserted at a mid-point upon the anterior rim 

 of the proximal phalanx of the middle finger. Upon 

 lateral aspect of the outer side of the muscles of the 

 forearm, the extensor digitorum communis lies next 

 below the extensor metacarpi radialis longior, occupy- 

 ing the middle of the group there found. 



75. The supinator Irevis l is exposed after remov- 

 ing the last-described muscle, to which it is rather 

 closely attached by a tendinous connection. It arises 

 from the external condyle of the humerus, below the 

 origin of the tendon of the extensor digitorum com- 

 munis, and passing directly in a nearly straight line to 

 the radius it becomes attached to the outer side of the 

 shaft of that bone for nearly one-third of its length. 

 This muscle, here quite feebly represented, acts, .as in 



1 " 84. M. ECTEP1CONDYLO-RADIALIS. 



Le court supinateur. Vicq d'Azyr, p. 573. 

 Cuvier. 



,, ,, ,, Gervais et AHx, p. 26 ; Alix, p. 407. 



Anleger des Vorderarrnes. Merrem, p. 155. 

 Aeussercr Speichenbeuger. Wiedeniann, p. 90. 

 Supinator. Tiedemann, 262. 



Schopss, p. 140, No. 27. 



Supinator brevis. Heusinger, p. 185, No. 14. 



Selenka, p. 129, No. 57 ; De Man, No. 22. 



,, ,, Watson, p. 93 ; Carlsson, p. 23. 



Riickwartswender. Meckel, p. 330, No. 8 und No. 7. 

 Antagonist der Niederzieher. Prechtl, 51." (Gadow in Bronn's 



Klassen, loc. cit., p. 269.) 



