THE GLUTEAL REGION. 



515 



internal pudic vesels and nerves, 

 and muscular branches from the 

 sacral plexus below it. Its up- 

 per border is connected with, the 

 Gluteus medius by the fascia 

 lata : its lower border is free and 

 prominent. 



Dissection. Now divide the Glu- 

 teus maximus near its origin by a ver- 

 tical incision carried from its upper to 

 its lower border: a cellular interval 

 will be exposed, separating it from 

 the Glutens medius and External 

 rotator muscles beneath. The upper 

 portion of the muscle is to be alto- 

 gether detached, and the lower portion 

 turned outward : the loose areolar 

 filling up the interspace be- 

 tween the trochanter major and tuber- 

 osity of the ischium being removed, 

 the parts already enumerated as ex- 

 posed by the removal of this muscle 

 will be seen. 



The Gluteus medius is a 

 broad, thick, radiated muscle, 

 situated on the outer surface of 

 the pelvis. Its posterior third is 

 covered by the Gluteus maximus ; 

 its anterior two-thirds by the 

 fascia lata. which separates it 

 from the integument. It arises 

 from the outer surface of the 

 ilium, between the superior and 

 middle gluteal lines, and from 

 the outer lip of that portion of 

 the crest which is between them ; 

 it also arises from the dense 

 fascia ( Gluteal aponeurosis) cover- 

 ing its outer surface. The fibres 

 converge to a strong flattened 

 tendon which is inserted into the 

 oblique line which traverses the 

 outer surface of the great tro- 

 chanter. A synovial bursa sepa- 

 rates the tendon of the muscle 

 from the surface of the trochanter 

 in front of its insertion. 



Relations. By its superficial 

 surface, with the Gluteus maxi- 

 mus behind, the Tensor vaginse 

 femoris and deep fascia in. front ; 

 by its deep surf-'i :>'-. with the 

 Gluteus minimus and the gluteal 

 vessels and superior gluteal nerve. 

 <tt f -rior border is blended 

 with the Gluteus minimus. Its 

 /<// border lies parallel with 

 the Pyriformis. the gluteal ves- 

 sels intervening. 



FIG. 329. Muscles of the hip and thigh. 



