368 Contributions to the 



very large fleshy mass, and are inserted down the whole 

 length of the femur, the principal portion of the Adductor 

 mag-nus being attached by a strong tendon to the internal 

 condyle. They would not only adduct the thigh strongly, 

 as in climbing, keeping the inverted sole against the tree, 

 but from the backward projection of the ischium, the Ad- 

 ductor magmis especially becomes a powerful extensor of 

 the limb for leaping. 



Psoas magnus. Arises from the four lumbar vertebrae, 

 and perhaps from the thirteenth dorsal ; some fibres also 

 seem to come from the upper part of the ilio-pectineal line, 

 wliich may represent the small, distinct muscle of the 

 Orang, described by Prof. Owen as coming from the 

 fore part of the ilium, and inserted at the root of the tro- 

 chanter minor. The Psoas is blended with the Iliacus in 

 the whole length of the latter, and both continue fleshy 

 quite to the insertion. 



Iliacus. See Psoas magmis. 



Scansorius, (Traill). This muscle arises from the 

 whole outer border of the ilium, nearly as far down as the 

 acetabulum, and is inserted into the lower part of the great 

 trochanter, between the origins of the Vastus extermis and 

 Crura'us. It would rotate the thigh a little inward from 

 its usual position, but its use is most obvious as an extra 

 flexor of the thigh ; it is a rather thin, but fleshy and per- 

 fectly distinct, broad, triangular muscle, but so far as I can 

 learn, it has been found only by Traill, who first discov- 

 ered it in his Chimpanzee, and by Prof. Owen in his 

 Orang. When its use is so apparent, it is strange that it 

 should be so rare, and so variable in the same species. 



Rectus femoris anticus. See Quadriceps femoris. 



Tensor vaginae femoris. This was larger than in man, 

 and continuous with the upper thin portion of the Glu- 

 tccus maximus. Like the Rectus, it would help to flex 

 the thigh. 



