42 



THE ARTISTIC ANATOMY OF ANIMALS 



muscles which, belonging to this regicn, arc directed for 

 insertion towards the hand. 



In animals, because of the movement of rotation of the 

 radius, the surface of this bone, which is anterior, corre- 

 sponds to the posterior surface of the same in man. (To 

 p( ssess a clear conception of this, it is necessary to remember 

 that, in this latter, the bones of the forearm are always 

 described as in the position of supination ; they are thus 

 represented in Fig. 28. The direction of the surfaces of 

 the radius is the reverse of that in animals, since the latter 

 have the radius always in a state of pronation.) 



Consequently it is on the anterior surface of the bone that 



Fig. 30. — Inferior Extremity of the Bone of the Forearm of the 

 Horse : Left Side, Anterior Surface. 



I, Radius ; A, groove for the long abductor and the short extensor of 

 the thumb ; B, groove for the radials ; D, groove for the common extensor 

 of the digits ; E, groove for the special extensor of the httle finger. 



we find the grooves concerning which it is necessary to give 

 some details. Regarding them in passmg from the radius 

 towards the ulna, those grooves give passage to the tendons 

 of the muscles whose names occupy the columns on p. 43. 

 The letters which are referred to each serve to define their 

 order, and to facilitate reference to Figs. 28, 29, and 30. 



We should mention that the groove E is situated, both in 

 man and in the dog, at the level of the inferior radio-ulnar 

 articulation ; but that in the horse, as the ulna does not 

 exist at that level, the groove is situated on the external 

 surface of the inferior extremity of the radius. It is neces- 

 sary to add that, in some horses, the ulna is, nevertheless, 



