170 Proceedings of the Royal Physical Society. 



surface of the great trochanter, and continuously with that 

 into the posterior surface of the shaft of the femur for nearly 

 three-fourths of its extent, and also by its anterior fibres, 

 very largely into the strong, deep fascia on the outer side 

 of the thigh. From the deep fascia of the thigh a strong 

 septum was sent inwards to be attached to the posterior 

 surface of the shaft of the femur from within a short distance 

 of the great trochanter down to the outer condyle. The 

 septum, on its way to the femur, split and enclosed the part of 

 gluteus maximus which lay in the thigh in a fascial sheath. 

 A large number of the lower or posterior fibres of gluteus 

 maximus did not obtain direct attachment to the bone, but 

 were inserted into the two laminse of the septum, and by 

 means of it were connected with the bone almost to the 

 lower end of the femur. The septum separated the extensor 

 muscles from the hamstring muscles and caudo-femoralis. 

 The spread-out fibres of gluteus maximus which were 

 inserted into the fascia of the thigh, together with those of 

 the tensor fasciae femoris in front, and of the biceps behind, 

 formed an almost complete muscular sheet on the outer 

 aspect of the thigh. 



The inferior gluteal nerve was represented by two branches 

 from the great sciatic nerve, one to each division of the 

 muscle. Each broke up into several branches before enter- 

 ing the muscle. The branch to the upper division of the 

 muscle was traced back to the 6th lumbar and 1st sacral 

 nerves, the branch to the lower division to the 1st and 2nd 

 sacral. 



Gluteus maximus in all true monkeys is thin and flat, and, 

 as compared with the corresponding muscle in man, it is 

 weak, the adoption of the erect attitude by man being the 

 self-obvious cause of its large size in man (1). In the lemur 

 the gluteus maximus is a large, powerful muscle, with 

 extensive origin and insertion, but even here the illustration 

 of the muscular system of G-alago crassicaudatics in Murie 

 and Mivart's account of the musculature of lemurs (2) shows 

 that the gluteus maximus, although, indeed, large and 

 powerful, does not equal in development the same muscle 

 in man. 



