OS INNOMINATUM. 



151 



broad, and divided into an external lip, an internal lip, and an intermediate 

 space. To the external lip is attached the Tensor vaginae femoris, Obliquus 

 externus abdominis, and Latissimus dorsi, and by its whole length the fascia 

 lata ; to the interspace between the lips, the Internal oblique ; to the internal lip, 

 the Transversalis, Quadratus lumborum, and Erector spinae. 



Fig. 98. Right Os Inuominatum. Internal Surface. 



The anterior border of the ilium is concave. It presents two projections 

 separated by a notch. Of these, the uppermost, situated at the junction of the 

 crest and anterior border, is called the anterior superior spinous process of the 

 ilium, the outer border of which gives attachment to the fascia lata, and the origin 

 of the Tensor vaginas femoris ; its inner border, to the Iliacus internus ; whilst its 

 extremity affords attachment to Poupart's ligament, and the origin of the Sartorius. 

 Beneath this eminence is a notch which gives attachment to the Sartorius muscle, 

 and across which passes the external cutaneous nerve. Below the notch is the 

 anterior inferior spinous process, which terminates in the upper lip of the aceta- 

 bulum ; it gives attachment to the straight tendon of the Kectus femoris muscle. 



