i ill ,]i -mi- 01 1 111 mi' 



i red by the glutaeus medius and minimus, the middle or main portion of the mus 

 beneath the glutaeus maximus, and the origin is situated within the pelvii 

 pelvit surface of the sacrum at the ma of the anterior sacral foramina II toI\ lentlya 



from between the foramina or con< ealing them I, and from the margin of tl tch. 



After leaving its flat and broad origin, the muscle b< • 



the middle of the great* r -< iati< foram( n, beneath the glutaei rather 



abruptly, and is inserted by a -lender rounded tendon into the tip of th< 



The piriformis does not fill tl itic foramen but divides it inti I 



which transmit both vessels and nerves, the sciatic nerve being ic h 



leave the pelvi( cavity through the l< impartment. 



The piriformi i usually supplied by din 

 times perforated by a portion 



Tin- obturator internus I 5 and .^00 to 302), like the piriformi 



pelvis, but it 1 i" the gluteal region through the les foramen. The mi 



from the obturator membrane and the adjacent surfaces of the pubis and ischium 

 tain extent, from the obturator fas< ia. It is very broad at its origin, but 

 rower as its fibe] vard the les ramen, in ] 



bends at almost a right angle around the margin of the i 



ard the bone being tendinous, and reaches the gluteal 1 

 slightly flattened tendon which passes directly to the trochantci .here ii 



After passing through the 1< »ramen and reaching the posterii 



pelvis, the mus< L >ory heads in the form of tl 



superior arises from the -pine of the ischium, tin llus in From tl 



Tluv are inserted into the tendon of the obturator internus almost throughout their 

 so that they together with the tendon form a kind of penniform muscli . Wl 

 internus bends about the margin of the lessei 1 then lantly 



bursa, the bur urator internus, and upon the muscle lies the thii 



The obturator ihcr with 1: 



the piril 1 the thigh. 



The quadratus femoris I a flat, thick, 1 I in 



front of the glutaeus maximus. It arises from the outer border of the tu ium 



and insert- by a short tendon into the intertrochanteric ridge. The upper margin of the mus 

 is in immediate relation with the gemellus inferior, and the lower margin with tl r mini- 



mil.-. Usually beneath the quadratus, or in th< r between it and the gemellus inferior, runs 



the obturator externus, upon which lies the sciatic nervt . 



Th< itus fem< 



The tensor fasciae latae Figs. 294 and 296) is a flat elongated muscle, narrow above and 

 broad below, which is situated between the two lay ia lata (see pa in the upper 



gluteal, trochanteric, and external femoral regions. It arises by a short and flat tendon from 



