DISSECTING MANUAL. 



coccyx; back of great sacro-sciatic ligament. Insertion; (su- 

 perficial fibres and upper half of deep fibres) fascia lata over 

 great trochanter, joining ilio-tibial band; (most of lower half 

 of deep fibres) gluteal ridge of femur; (lowest deep fibres) 

 fascia lata, being thus connected with external intermuscular 

 septum and origin of short head of Biceps. Under it are three 

 bursae; one (inconstant) over the ischial tuberosity; one over 

 the outer side of the great trochanter; and one over the Vas- 

 tus externus. ' [368] 



Tensor Fasciae Femoris. Origin ; dorsum ilii external to an- 

 terior superior spine, and upper part of notch below it. Course ; 

 downward superficially in a separate investment of fascia lata. 

 Insertion; fascia lata, about level of great trochanter (ilio- 

 tibial band). [369] 



Gluteus Medius. Origin; dorsum ilii, between the iliac 

 crest and superior curved line above and middle curved line 

 below; fascia lata covering its anterior surface. Course; under 

 Gluteus maximus in front. Insertion ; diagonal line on outer 

 surface of great trochanter, a bursa lying under its tendon on 

 the trochanter. [370] 



Gluteus Minimus. Origin; dorsum ilii, between middle and 

 inferior curved lines. Course; under two preceding muscles. 

 Insertion ; outer border of anterior surface of great trochanter, 

 and (sometimes) front of upper border. A bursa lies under its 

 tendon on the great trochanter. [370] 



Pyriformis. Origin; pedicles of second, third, and fourth 

 sacral vertebrae; upper margin of great sacro-sciatic notch. 

 Course; through great sacro-sciatic notch. Insertion; facet 

 on upper border of great trochanter. [371] 



Obturator Internus (occupying pelvic aspect of os innomi- 

 natum). Origin; whole margin of thyroid foramen, except 

 obturator notch ; obturator membrane ; smooth surface of hip 

 bone behind thyroid foramen; (slightly) parietal pelvic fascia 

 covering it. Course; converging and ending in several tendons 

 which pass through the lesser sacro-sciatic foramen, hook round 



[276] 



