CHAP. IV.] 



THE SKELETON OF THE LIMBS. 



105 



The innominate bone tlius consists of three parts : — 

 (1). An elongated upper part joins the sacrum and extends down 

 to the socket for the thigh. This is the ilium (<7). 



Fig. C5.— Right Os Innominaxum, External Aspec 



Fig. CO.— Right Os Innominatum, Inner Aspect. 



a. Acetabulum. 



ar. Auricular surface. 



c. Crest of the ilium. 



i. Articular surface of pubis. 



il. Ulum. 



ip. Spine of ischium. 



o. Obturator foramen. 



j7. Tuberosity of ischium. 



t. Pubis. 



The ilio-pectineal eminence is seen in Fig. A., 

 between n and t, and in Fig. B., above t, on 

 aline with the upper margin of the obturator 

 foramen. 



(2). From the thigh-socket a bar of bone runs downwards, in- 

 wards, and ultimately backwards. This is the pubis (Fig. 64, 

 2^, and Figs. 65 and 66, t). 



