The Lower Extremity and Pelvis 



119 



tuberosity with facets on its postero-external aspect for the origin of the hamstring 

 muscles : above this is the lesser sciatic notch, which is separated from the great notch 

 by the sharply projecting spine of the Ischium. In front of the Ischium and between 

 it and the body of the pubis is a large hole, the obturator foramen (or thyroid foramen), 

 which is bounded below by the Isckio-pubic ramus, a compound of a lower ramus 

 projecting forward from the Ischium, and one, the lower ramus of the pubis, projecting 

 back from the-pubis. The body of the pubis forms the front boundary of the obturator 

 foramen and, with the Ischio-pubic ramus, gives origin to the Adductor group of 



r rdnui . 

 at pubis. 



FIG. 96. View of right innominate from the outer side. 



muscles : its inner border is the symphysis, which is connected with its fellow of the 

 opposite side by means of an intervening plate of nbro-cartilage : the upper end of the 

 symphysis forms the angle at its junction with the crest, which gives attachment to 

 the Rectus abdominis and terminates externally in the prominent point of the spine, 

 to which Poupart's ligament is attached. Outside this the upper ramus extends to 

 the Ilio-pectineal eminence, where it joins the Ilium ; its front border gives attach- 

 ment to the pubo-femoral band of the hip capsule, and overhangs the obturator 

 foramen. 



Thus the outer aspect of the bone shows four margins, of which the upper and 



