274 



THE SKELETON. 



taking a curved direction backward and downward, terminates at the middle of 

 the great sacro-sciatic notch. The surface of bone included between the middle 

 and inferior curved lines is concave from above downward, convex from before 

 backward, and affords attachment to the Gluteus minimus muscle. Beneath the 

 inferior curved line, and corresponding to the upper part of the acetabulum, is a 

 roughened surface (sometimes a depression), to which is attached the reflected 

 tendon of the Rectus femoris muscle. 



The Internal Surface (Fig. 208) of the ilium is bounded above by the crest ; 

 below it is continuous with the pelvic surface of the os pubis and ischium, a faint 



COMPRESSOR URETHR/e. 



^^^^ TRANSVERSUS PEHINEI- 



Crus penis. ER \ CTOR PEN1S . 

 FIG. 208. Right os innominatum. Internal surface. 



line only indicating the place of union ; and before and behind it is bounded by 

 the anterior and posterior borders. It presents anteriorly a large, smooth, concave 

 surface, called the internal iliac fossa, or venter of the ilium, which lodges the 

 Iliacus muscle, and presents at its lower part the orifice of a nutrient canal ; and 

 below this a smooth, rounded border (iliac portion of the linea ilio-pectinea\ which 

 separates the iliac fossa from that portion of the internal surface which enters into 



