1882.] ANATOMY OF ERETHIZON DORSATUS. 2S5 



The pectineus extends from the brim of the pelvis dorsad of the 

 origin of the third part of the adductor; it is inserted into the 

 femur just below the lesser trochanter. 



The vastus externus is very large, its origin extending right up 

 to the summit of the great trochanter. 



The vastus interims also extends very high up, namely up to the 

 neck of the femur, dipping in within the insertion of the psoas. 



The crureus extends up to the neck of the femur, and is very im- 

 perfectly separated from the vastus interims. 



The rectus femoris has the usual origin and insertion. 

 The tibialis anticus is very large, but does not take origin from 

 the femur ; it arises from the head of the fibula and the upper third 

 of the tibia. Below its ends are two tendons, one of which is 

 inserted into side of the proximal end of the metatarsal of the 

 hallux, while the other goes to the plantar surface of the ectocunei- 

 forme. 



The extensor longus dicjitorum arises by a tendon from the femur 

 external to its rotular surface. It is a slender muscle, and sends 

 tendons to the four outer digits. 



The extensor longus hallucis is very slender and small, arising only 

 from the distal third of the fibula. 



The extensor brevis diyiiorum arises as usual, and sends tendons 

 to the four outer digits. 



The peroneus longus is the most external of the peronei muscles, 

 and arises from the head of the fibula. Passina; behind the 

 external malleolus, it proceeds to the metatarsal of "the hallux as 

 usual. 



The 'peroneus brevis arises from the antero-external aspect of the 

 fibula. It is muscular down to the level of the malleolus, and ends 

 in a very strong tendon (the largest of the peronei tendons), which 

 is inserted into the proximal end of the fifth metatarsal. 



The peroneus quinti dicjiti is very slender, both as to its muscular 

 belly and its tendon. It arises from the outside of the fibula, 

 beneath the peroneus longus and behind the peroneus brevis, and in 

 contact with the flexor longus hallucis. It becomes tendinous above 

 the external malleolus ; and its slender tendon is inserted into the 

 proximal part of the proximal phalanx of the fifth digit. 



The gastrocnem'ms has but the two normal heads, and is inserted 

 into the calcaneal tuberosity. 



The soleus is very large and fleshy ; it arises from the outer side 

 of the upper two thirds of the fibula, and joins the tendo Achillis. 



The plantaris takes origin from the pit on the outer side of the 

 external condyle of the femur, beneath the external lateral ligament. 

 It ends as in the Agouti'. 



The popliteus is as in the Agouti, 



The flexor longus digitorum is a large muscle arising from the 

 tibia beneath the pophteus ; its tendon passes in a groove behind the 

 internal malleolus, superficially to that of the tibialis posticus. It 



1 P. Z. S. 1800, p. 414. 



