GLUTEUS MAXIMUS 



III 



The pelvic fascia is a continuation of the transversalis fascia 

 which lines the abdomen and of the iliac fascia which covers the 

 iliacus muscle. It covers the obturator muscle and its fascia and 

 the muscles of the floor, and forms ligaments for the pelvic viscera. 



THE PELVIS EXTERIOR 



Three gluteal muscles. From the three gluteal lines of the os 

 coxae and the spaces above them, arise three gluteal muscles. 



Gluteus minimus. Origin. The in- 

 ferior line and space above it. Insertion. 

 The front of the great trochanter. 



Action. It abducts the thigh and ro- 

 tates the femur slightly inward (so that 

 the foot turns in). 



Gluteus medius. Origin. The an- 

 terior or middle line and space above it 

 up to the crest. Insertion. The outer 

 surface of the great trochanter. 



Action. Abduction of the femur and 

 some rotation outward. 



Nerve of both. Superior gluteal. 



Gluteus maximus. Origin. 

 The posterior line and space behind 

 it to the crest (also from the back 

 of sacrum). Insertion. The back 

 of great trochanter and the ridge 

 below it, also the deep fascia, or 

 fascia lata. 



Action. External rotation of the 

 femur; it is also a powerful exten- 

 sor of the hip-joint when one rises from the sitting position, or 

 in mounting steps. It also abducts the- thigh. 



Nerve. Inferior gluteal. 



Obturator externus. Origin. The obturator membrane and bone around 

 it. Insertion. The fossa of the great trochanter. Action. External rota- 

 tion of the femur. (Fig. 83.) 



FIG. 90. THE GLUTEUS MAXIMUS. 

 (Fascia removed.) (Sappey.) 



Nerve. Obturator. 



