152 



THE MYOLOGY OF THE RAVEN. 



FIG. 42. Anterior aspect of the hones of the left hand of a Raven, with the 



pollex digit removed ; designed to show the origin and insertion of 



some of the muscles or their tendons. 

 FIG. 43. Ulnar aspect of the same bones ; the axis of the extensor proprius pollicis 



muscle is shown, and its origin indicated upon a piece of the extensor 



metacarpi radialis lonyior, given above. 

 FIG. 44. Posterior aspect of the same bones. The several segments in all the 



figures are slightly dislodged in order to show them to better advantage. 



Specimens all life-size, and drawn by the author. 



The action of this muscle is to flex the hand upon the 

 forearm, and at the same time rotate it slightly to the 

 inner side. 



