252 



MUSCLES OF THE GLUTEAL REGION. 



Relations. By its superficial surface with a thin aponeurotic fascia 

 which separates it from the superficial fascia and integument, and 

 with the vastus externus, a bursa being interposed. By its deep sur- 

 face with the gluteus medius, pyriformis, gemelli, obturator interims, 

 quadratus femoris, sacro-ischiatic foramina, great sacro-ischiatic liga- 



Fig. 103.* 



ment, tuberosity of the ischium, semi-membranosus, semi-tendinosus, 

 biceps, and adductor magnus ; the gluteal vessels and nerves, ischiatic 

 vessels and nerves, and internal pudic vessels and nerve. By its 

 upper border it overlaps the glutens medius ; and by the lower border 

 forms the lower margin of the nates. 



* The deep muscles of the gluteal region. 1 . The external surface of the 

 ilium. 2. The posterior surface of the sacrum. 3. The posterior sacro-iliac 

 ligaments. 4. The tuberosity of the ischium. 5. The great or posterior 

 sacro-ischiatic ligament. 6. The lesser or anterior sacro-ischiatic ligament. 

 7. The trochanter major. 8. The gluteus minimus. 9- The pyriformis. 

 10. The gemellus superior. 11. The obturator internus muscle, passing out 

 of the lesser sacro-ischiatic foramen. 12. The gemellus inferior. 13. The 

 quadratus femoris. 14. The upper part of the adductor magnus. 15. The 

 vastus externus. 16. The biceps. 17. The gracilis. 18. The semi-tendi- 

 nosus. 



