GLUTEAL REGION. 233 



vexity, over which it passes, with an interposed synovial bursa ; 

 a small fleshy insertion is often found posteriorly. 



Relation. Externally with the externus and the fascia ; 

 internally with the internus, sacro-sciatic 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. S3. 



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

 of gluteus inaximus ; 6, Gluteus internus ; c, Common tendon of obturator 

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

 femoralis. 



GLUTEUS INTERNUS. 



(Ilio-trochanterius Parvus. ) 

 (FiG. 83. b.) 



Situated underneath the maximus and above the hip joint, 

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

 outwards. 



Origin. From the shaft of the ilium, the ischiatic spine, and 

 the capsular ligament of the hip joint. 



