MYOLOGY 183 



digits, and each of them is inserted, as in the human species, 

 to the second and third phalanges. 



In the pig, the anterior extensor of the phalanges is rather 

 complicated in its arrangement. Its fleshy body is divided 

 into four bundles terminated by tendons, which in turn 

 divide and join certain digits ; whence the special names 

 given to each of these fasciculi, commencing with the most 

 internal, of : proper extensor of the great inner toe ; common 

 extensor of the two inner toes ; common extensor of the two 

 outer toes ; and proper extensor of the great outer toe. 



In the ox, the same muscle is divided into two bundles : 

 the internal proceeds to the internal toe, the external is 

 common to the two toes. 



In the horse, the tendon of the anterior extensor of the 

 phalanges is divided into two parts of unequal bulk. The 

 smaller of these tendinous slips, which is the more external, 

 unites at the level of the superior part of the metacarpus 

 with the tendon of the muscle which we are about to 

 study in the following paragraph (Fig. 75, 16). The larger, 

 after having reached the anterior surface of the digit, is 

 attached to the anterior aspect of the first and second 

 phalanges, and then forms a terminal expansion which is 

 inserted into the pyramidal eminence of the third. 



At the level of the first phalanx this tendon receives on 

 each of its lateral aspects a strengthening band, which 

 proceeds from the terminal extremity of the suspensory 

 ligament of the fetlock,"^ and crosses obliquely downwards 

 and forwards over the surface of the first phalanx to join 

 the extensor tendon (Fig. 75, 12). 



A similar arrangement is found in the ox. 

 This band is noticeable under the skin which covers the 

 lateral aspects of the ham. 



As the name indicates, this muscle extends the phalanges, 

 one upon the other. It also contributes to the extension 

 of the hand, as a whole, on the forearm. 



Extensor Minimi Digiti (Fig. 73, 10 ; Fig. 74, 15, 16 ; 

 Fig. 75, 14, 15). — ^This muscle, the lateral extensor of the 

 phalanges of veterinary anatomy, situated on the external 



* See p. 200 or a description of this ligament. 



