34 



ANATOMY FOE, NURSES. 



[CHAP. IV. 



and front wall of the pelvic cavity. In young subjects it con- 

 sists of three separate parts, and although in the adult these 

 have become united, it is usual to describe the bone as divisible 

 into three portions, the ilium, the ischium, and the pubes. The 



H 



FIG. 31. O8 INNOMINATUM. Outer surface. R, 0, crest of ilium, just below 

 is seen the upper anterior spinous process ; J, tuberosity of ischium ; T, part of 

 pubes, between J and T is seen the thyroid foramen ; H, acetabulum, below // is 

 seen end of pubic bone which, with its fellow of opposite side, forms the symphysis 

 pubis. (For further illustration, vide Figs. 45 and 4(5.) 



ilium, so called from its supporting the flank, is the upper broad 

 and expanded portion which forms the prominence of the hip. 

 The ischium is the lower and strongest portion of the bone, 

 while the pubes is that portion which forms the front of the 

 pelvis. Where these three portions of the bone meet and finally 

 ankylose is a deep socket, called the acetabulum, into which the 

 head of the femur fits. Other points of special interest to note 

 in the ossa innominata are (1) the spinous processes formed by 



