CHAP. V.] 



THE CAT'S MUSCLES. 



159 



round the rectus fomoris in front. It 

 arises from the whole outer surface of 

 the femur and great troclianter. 



The third part, or castus mternm, 

 springs from the inner side and front of 

 the femur, right up to the capsular lio-a- 

 ment (Fig. 84). 



The fourth part, or crurcus, arises from 

 the lower half of the front of the femur. 



The leg has five long muscles in front 

 and seven behind. 



The tibiaUs anticus takes origin from 

 the fossa on the outer side of the upper 

 fourth of the tibia, from the adjacent part 

 of the fibula, and from the intervening 

 inter-osseous ligament. It is inserted by 

 a strong tendon into the dorsum of the 

 rudimentary first metatarsal. It covers 

 over the upper third of the extensor 

 longus digitorum, and its action is to 

 bend the foot forwards and inwards on 

 the leg. 



The extensor longus digitomm pedis 

 arises by a strong tendon from the pit on 

 the femur, which is situate just outside the 

 outer margin of the groove for the patella. 

 At the ankle it passes through a strong 

 tendinous loop devoted to it alone, and 

 which loop is attached to a concavity 

 on the upper surface of the os calcis, in 

 front of (below) the astragalus. Before 

 passing through the loop it is already 

 divided into four tendons, which go to 

 the exterior sheaths of the four digits. 



The pcroneus longus is a very notable 

 muscle which takes origin from the head 

 of the fibula around the attachment of 

 the external lateral ligament. It ends 

 by a tendon which passes down in front 

 of the external malleolus in a special 

 groove in the front of the fibula, which 

 groove is bridged over by a tendinous 

 arch lined by synovial membrane. 

 Passing superficially to the tendons of 

 the two muscles next described, it dips 

 in beneath the deepest plantar muscles, 

 and traversing the channel formed for 

 it by the groove beneath the cuboid and 

 the peculiar process of the onto -cuneiforme, 



GrlTl 



Gcoc 



Fig. 85. FLEXOR MUSCLES OF 

 LEG, THE GASTROCNEMICS, PLAN- 

 TARIS AND SOLEUS BEING REMOVED. 



^l 1 and A 2 . Accessorins. 



Fl). Flexor brevis digitorum, 



cut and reflected 

 Fid. Flexor longns digitorum. 

 F I h. Flexor longus hallucis. 

 Gex. External head of Gastro- 



cnemins. 



Gin.. Internal head of ditto. 

 L l , 2 , and 3 . Lumbrical muscles. 

 Oo. Os Calcis cut short ott'. 

 P b. Peronens brevis. 

 P I. Peroneus longus. 

 Pop. Popliteus. 

 P '[ d. Peroneus quinti digiti. 

 .s'oJ. Soleus. 

 Tfp. Tendon of deep flexor 



muscle <. 

 Tp. Tibialis posticus. 



