MUSCLES OF THE LEG AND FOOT 



317 



The quadratus femoris is large. 



The obturator externus resembles that of the horse. 



The obturator internus is extensive and strong; its tendon emerges through 

 the obturator foramen. 



The gemellus is fused in part with the obturator internus. 



The quadriceps femoris is more clearly divided than in the horse, and its 

 action is transmitted by a single patellar ligament. 



The capsularis is absent. 



MUSCLES OF THE LEG AND FOOT 



The peroneus tertius resembles that of the ox, but its 

 tendon is not perforated by that of the tibialis anterior, 

 and ends on the inner (second) large metatarsal bone, de- 

 taching a strong branch to the first and second tarsal 

 bones. 



The tibialis anterior arises on the tibial crest. Its 

 tendon passes over the hock along the inner border of the 

 tendon of the peroneus tertius (both being bound down 

 by an annular ligament), and is inserted into the inner 

 (second) metatarsal and first tarsal bones. 



The peroneus longus lies partly on the outer surface 

 of the peroneus tertius. Its tendon crosses those of the 

 lateral extensor, passes along a groove on the plantar 

 surface of the fourth tarsal bone, and ends on the first 

 tarsal and second metatarsal bones. 



The anterior or long digital extensor arises with the 

 peroneus tertius and is largely covered by it and the per- 

 oneus longus. It divides into three parts. The tendon 

 of the inner division (M. extensor digiti tertii) ends on 

 the inner chief (third) digit ; that of the middle division 

 by two branches on the principal digits; and that of the 

 outer division by three branches on the second, fourth, 

 and fifth digits. 



The lateral digital extensor divides into proper ex- 

 tensors of the fourth and fifth digits (Extensores digiti 

 quarti et quinti). 



The extensor hallucis longus arises on the fibula and 

 ends on the inner small (second) digit. 



The extensor digitalis brevis is well developed and 

 consists of three parts. The inner and outer tendons end 

 on the first phalanges of the chief digits, the middle 

 one joins the common extensor tendon of the same. 



The gastrocnemius presents nothing special. 



The soleus is wide, and is partly blended with the 

 external head of the gastrocnemius. 



The superficial digital flexor has a large belly. Its 

 tendon ends on the two chief digits, and is also connected 

 with the ligaments of the accessory digits. 



The inner head of the deep digital flexor (flexor digitalis longus) is relatively 

 small. The common tendon ends as in the thoracic limb. 



The popliteus ]iresents no special features. 



The plantar muscles resemble their homologues of the fore limb, except that 

 the adductors of the accessory digits and the lumbricales are absent. 



Fig. 228. — Muscles of Leg 

 AND Foot of Pig, An- 



TERO-EXTERNAL ViEW. 



a, Tibialis anterior; a', 

 tendon of preceding; b, pero- 

 neus tertius; b' , tendon of b; 

 c, anterior or long digital ex- 

 tensor; d, e, f, /', /", tendons 

 of c; g, peroneus longus; g', 

 tendon of g; h- extensor digiti 

 quarti; h' , tendon of 'i. which 

 receives h" , from the inter- 

 osseus inedius; i. extensor 

 digiti quinti; k. deep digital 

 flexor; I, soleus; m. gastroc- 

 nemius; n, extensor brevis. 

 (After EUenberger, in Leiser- 

 ing's Atlas.) 



