448 MUSCLES. 



The Glutceus Medius, 



Arises from the whole length of the crista of the ilium, ex- 

 cept its posterior third; from that part of the dorsum of the bone 

 which is between its crista and the semicircular ridge, extend- 

 ing from the anterior superior spinous process to the sciatic 

 notch; from the lunated edge of the os ilium, between the an- 

 terior superior and the anterior inferior spinous process ; and 

 from that part of the inner face of the fascia femoris which co- 

 vers it. 



The anterior superior part of this muscle is not covered by 

 the glutaeus magnus, but lies before it. Its fibres converge, and 

 are inserted, by a broad tbick tendon, into the upper surface of 

 the trochanter major, and into the upper anterior part of the 

 shaft of the bone just in front of the trochanter. 



It draws the thigh backwards and outwards. 



A bursa is interposed between the extremity of its tendon and 

 the tendinous insertions of the small rotator muscles. 



The GlutcBus Minimus, 



Arises from that part of the dorsum of the ilium between the 

 semicircular ridge just spoken of, and the margin of the capsu- 

 lar ligament of the hip joint. It is entirely concealed by the 

 glutaeus medius. 



Its fibres converge and terminate in a round tendon, which is 

 inserted into the anterior superior part of the trochanter major, 

 just within the anterior insertion of the glutaeus medius. 



It abducts the thigh, and can also rotate the limb inwards. 



A bursa of small size exists between its tendon and the tro- 

 chanter major. 



There are several small muscles about the hip joint, the most 

 of which can be seen by the removal of the glutasus magnus. 



The Pyriformis, 



Arises, fleshy and tendinous, within the pelvis, from the an- 

 terior face of the second, third, and fourth bones of the sacrum. 



