42 ANATOMY. 



membrane. The Cotyloid Notch is a deficiency in its lower anterior 

 margin, transmitting nutrient vessels to the joint ; to the edges of the notch 

 is attached the ligamentum teres, and it is bridged over by the transverse 

 ligament, a continuation of the cotyloid ligament which surmounts the 

 brim of the acetabulum. 



Obturator, or Thyroid Foramen? on the anterior surface between the pubes 

 and ischium, large and oval in the male, small and triangular in the 

 female ; is closed by the obturator membrane, except above where the 

 obturator nerves and vessels pass through it. 



Describe the Ilium. It is the superior part of the innominate bone, and 

 presents the following points, viz. 



Crest?- along its upper border, having an outer and inner lip for muscular 

 attachment, and ending in the superior spines. 



Anterior Superior Spine? to which is attached 

 the sartorius and tensor vaginas femoris mus- 

 cles, and Poupart's ligament. 

 Anterior Inferior Spine for the straight tendon 



of the rectus femoris. 



Notch, between the above-named spines, trans- 

 mitting the external cutaneous nerve, and 

 lodging some fibres of the sartorius. 

 Posterior Superior Spine? 9 for the attachment of 

 the erector spinaa muscle, and the oblique part 

 of the sacro-sciatic ligament. 

 Posterior Inferior Spine?-' 1 for the great sacro- 

 sciatic ligament. 

 Great Sacro-sciatic Notch}* below the last-named 



spine, transmits the great sciatic, superior gluteal, and pudic nerves, the 

 pyriformis muscle, and the sciatic, pudic, and gluteal vessels, and a nerve 

 supplying the obturator externus muscle. 

 Curved Lines, 21 superior middle and inferior, on the outer surface of the 



bone, from the spaces between which arise the glutei muscles. 

 Groove, above the acetabulum, for the reflected tendon of the rectus femoris 



muscle. 

 Linea Ilio-pectinea, in part ; on the inner surface, above which is a smooth 



surface, the Venter of the Ilium. 

 Auricular Surface?* rough, articulates with the sacrum. 



Describe the Ischium. It is the lowermost portion of the innominate bone, 

 and presents the following points, viz. 



Body, forms two-fifths of the acetabulum, and the external margin of the 



