66 PROFESSOR OWEN ON THE AYE-AYE. 



The mesogluteus (PI. XXV. fig. 3, 5) is a long and very thick muscle, arising from 

 the outer side of the ilium and the fascia covering the sacrum, the fibres converging 

 to be inserted into the upper part of the great trochanter. 



The entogluteus arises from the lower part of the ilium and adjoining part of the 

 ischium, to near the tuberosity, and is inserted into the great trochanter on the inner 

 side of the mesogluteus. The great ischiatic nerve and artery lie between the posterior 

 margins of these muscles. The entogluteus is attached to the underlying part of the 

 capsule of the hip-joint. 



The vastus externus (PI. XXV. figs. 1 & 3, 17) arises from the fore and under part of 

 the trochanter major, by a short tendon, visible on its outer side only. It rapidly swells 

 into a large fleshy mass, forming the outer part of the thigh, and converges to a flattened 

 tendon, which is closely blended with the capsule of the knee-joint as it passes to its 

 insertion into the upper and outer part of the patella. It sends off no fleshy fasciculus 

 to the rectus femoris, as observed by Vrolik in Stenops^. 



The rectus femoris (Pis. XXIV. & XXV. figs. 1-3, le) rises by a strong round tendon from 

 the upper part of the acetabulum, and by a shorter tendon (fig. 3, b) from the inferior 

 spine of the ilium. The muscle becomes fleshy at the junction of these, is fusiform, the 

 strong subdepressed tendon being inserted into the upper part of the patella. 



The vastus internus (Pis. XXIV. & XXV. figs. 1 & 2, is) arises from the fore part of 

 the great trochanter, becomes attached by a fascia to the inner side of the rectus femoris, 

 developes a slender tendon on that side, which goes to the ligamentum patellae, and then 

 spreads into a thin fascia attached to the inner side of the knee-joint and hgamentum 

 patellae. 



The crureeus (PI. XXV. figs. 2 & 3, 19) arises from the whole of the inner and fore 

 part of the femur, quitting the bone only at the lower end to spread over the upper part 

 of the capsule of the knee-joint prior to being inserted into the corresponding part of 

 the patella. The outer division of the cruraeus (fig. 3, 19) is rather a distinct muscle, 

 which might be termed the deep-seated vastus externus : it arises from the fore and 

 outer part of the femur to the condyloid expansion, and is inserted by a fascia into the 

 outer part of the ligamentum patellae and capsule of the knee-joint. 



The pectintsus (PL XXV. fig. 2, 13) arises from the upper part of the pubis, near 

 the symphysis, and is inserted below the lesser trochanter. Beneath it are strong and 

 thick gemelli, converging from their origin on the anterior surface of the pubis and 

 ischium to the interspace between the small and large trochanter. 



The gastrocnemius (Pis. XXIV. & XXV. 27) arises by the usual outer (fig. 2, n, a) 

 and inner (fig. 2, 27, b) heads from the back part of the corresponding condyles, 

 the tendons being strengthened each by a sesamoid ossification. The outer head 

 principally receives the accession of fibres from the upper part of the fibula, called soleus 

 (fig. 3, 28) ; after which they combine into a single mass, which becomes tendinous on the 



' Op. cit. p. 46. 



