GLUTEAL REGIONS. 233 



Texity, over which it passes, with an interposed synovial bursa ; a 

 small fleshy insertion is often found posteriorly. 



Relation. — Externally with the extemus and the fascia; 

 internally with the internus, sacro-sciatio ligament, and the 

 ilium ; anteriorly with the fascia lata and the longissimus dorsi; 

 posteriorly with the triceps abductor femoris. The inner and 

 anterior portion which terminates in the anterior tendon has 

 been rather unnecessarily described as a separate muscle ; this 

 possible separation is shown in Fig. 83. a. 



Action. — To extend the femur on the pelvis, and when the 

 posterior limbs are fixed, to assist in rearing. 



Fig. 83. 



Deep-seated muscles of the gluteal region, a. Deep anterior portion of 

 gluteus maximus ; b. Gluteus internus ; c. Common tendon of obturator 

 internus and pyrifonnis ; d d, Gemellus anticus and posticus ; e, Ischio- 

 femoralis. 



GLUTEUS INTERNUS. 



(lUo-trochanterius Parvu&.) 



(Fig. 83. 6.) 



Situated underneath the maximus and above the hip joint, 

 this is a short and fan-shaped muscle, the fibres converging 

 outwards. 



OHgin.— From the shaft of the ilium, the ischiatic spme, and 

 the capsular ligament of the hip joint. 



