28 



ON THE ANATOMY OF THE 



animal. The iliacus interims, and insertion of the 

 psoas magnus, have nothing peculiar. The gluteus 

 externus, which is called maocimus in man, is 

 much smaller than the medius, being very thin, 

 while the latter is extremely thick and fleshy. From 

 the elongated form of the ilia, they also differ 

 much in form from the human glutei. The exter- 

 nus does not come so far forward, nor does it arise 

 from so large a portion of the ilium. Tyson did 

 not perceive a gluteus minimus ; but we found an 

 extremely thin muscle, answering to it in office, 

 which might easily be overlooked in a hasty exa- 

 mination. Its origin is from the posterior edge of 

 the ischium, instead of the dorsum of the ilium. 

 Its fleshy fibres are most distinct along the sciatic 

 notch ; and as it descends toward the obturator in- 

 ternus, it becomes a thin tendinous expansion. It 

 is attached to the capsular ligament of the hip-joint, 

 both at the edge of the acetabulum and where it 

 joins the neck of the femur ; the insertion is into 

 the great trochanter, as in man. This muscle, there- 

 fore, is to be considered partly as aiding the rota- 

 tion of the thigh, pulling it outward, but seems 

 principally intended to prevent the pinching of the 

 ligament in the motions of the joint. See fig. G e. 



The most remarkable muscle about the top of 

 the thigh, has not been noticed by Tyson, Camper, 

 Cuvier, or the older anatomists. It is a flat trian- 

 gular muscle, arising from the whole anterior edge 

 of the ilium to within half an inch of the aceta- 



