CHAPTER XXXI. 

 THE GLUTEAL REGION. 



MUSCLES AND THEIR ACTIONS. 



STRUCTURES BENEATH GLUTEUS MAXIMUS. 



LANDMARKS. 



The superficial fascia in this region is thick and coarse, 

 especially towards the lower part of the buttock, while the 

 deep fascia, termed from its extent the fascia lata, is at- 

 tached to the crest of the ilium above, to the lower part of 

 the vertebral aponeurosis behind and to the border of the 

 tuberosity and the ascending ramus of the ischium below 

 and internally. The fascia lata invests all the muscles of 

 the thigh. 



Muscles. The Tensor Vagina Femoris arises from 

 the front of the outer lip of the crest of the ilium ahd half 

 of the notch between the anterior superior and the anterior 

 inferior spines, and is inserted into the fascia lata below 

 the level of the great trochanter. It may be regarded as 

 an interrupted portion of the gluteus maximus, since it is 

 inserted, like it, into the fascia lata of the thigh. This 

 muscle abducts the thigh and rotates it inward, and is, 

 like the gluteus maximus, a tensor of the fascia lata, thus 

 assisting in the completion of the act of extension of the 

 leg, by drawing upwards the external tuberosity into 

 which the fascial band is inserted. The Gluteus Maximus, 

 arising from the posterior fifth of the crest of the ilium 

 and from the outer surface of the bone between the crest 

 and the superior curved line, from the fascia over the 

 erector spinse muscle and from the posterior surface of the 

 sacrum and coccyx, is inserted into the fascia lata and into 

 the line leading from the great trochanter to the linea 

 aspera the upper half of the muscle and the superficial 



