230 THE ARTISTIC ANATOMY OF ANIMALS 



and ruminants. It finally terminates in the same way as 

 the muscle with which we have compared it (see p. 197). 



In the horse, its fleshy body is but slightly developed, 

 so that its tendon alone is specially visible in the super- 

 ficial muscular layer, but in the dog and the cat it is 

 large. Hence it results that its fleshy body appears 

 on each side of the inferior half of the gastrocnemius, 

 and produces an elevation which recalls that which the 

 soleus produces on each side of the same muscles in the 

 human species. 



The muscles which follow form, with the popliteus, which 

 we have already studied, the deep layer of the posterior 

 region of the leg. 



Flexor Longus Digitorum (Fig. 87, 19 ; Fig. 88, 17). — 

 This muscle, in man, is the only common flexor of the toes 

 belonging to the muscles of the leg. 



In comparison with the preceding muscle, it is a deep 

 flexor. Veterinarians have given it the name of the oblique 

 flexor of the phalanges. 



Visible on the internal aspect of the superficial layer of the 

 muscles of the leg, this muscle arises above from the pos- 

 terior surface of the external tuberosity of the tibia, becomes 

 tendinous, passes towards the metatarsus, and blends with 

 the tendons of the posterior tibial and the long proper 

 flexor of the great-toe. In the dog and the cat it is blended 

 with this latter only. 



Tibialis Posticus (Fig. 85, 14; Fig. 86, 12; Fig. 87, 20; 

 Fig. 88, 16). — This muscle arises from the external tuber- 

 osity of the tibia, and from the head of the fibula. Thence 

 it passes to the tarsus, and terminates in different fashion 

 in carnivora and other quadrupeds. 



In the dog and the cat, it is inserted into the ligamentous 

 apparatus of the tarsus, or into the base of the second 

 metatarsal. 



In the other quadrupeds with which we are here occu- 

 pied it is blended with the long proper flexor of the 

 great-toe. 



It is accordingly in the carnivora that the mode of ter- 

 mination of the tibialis posticus most nearly resembles 



