i68 Anatomy of the Rabbit. 



anterodorsal margin of the bone, the latter forming the projecting 

 end of the wing, which is distinguished as the iliac crest (crista 

 iliaca). This portion is considerably thicker than the related 

 dorsal and ventral margins, and also bears on its medial side a 

 somewhat hook-shaped process Its an tero ventral angle is the 

 superior anterior spine (spina anterior superior) or tuber coxae. 

 The ventral margin is slightly longer than the dorsal margin, and 

 is also concave. It is associated with the pubic border of the body 

 of the ilium, and is not connected with the inferior anterior spine. 



The ischium (os ischii) extends backward from the acetabulum, 

 its axis continuing that of the ilium. It consists of a basal portion, 

 or body (corpus oss. ischii), a superior ramus, and an inferior 

 ramus. The body of the ischium is for the most part cylindrical. 

 It forms the posterior part of the acetabulum, and presents in 

 connection with the latter a deep acetabular notch (incisura 

 acetabuli), which tends to interrupt the articular surface. The 

 acetabular notch leads forward into a depression of the centre of the 

 articular basin, the acetabular fossa (fossa acetabuli). In the 

 natural condition the combined depressions serve for the attach- 

 ment of the round ligament of the head of the femur. The dorsal 

 margin of the bone, belonging in part to the body and in part to the 

 superior ramus, bears a short hook-like projection, the ischial 

 spine (spina ischiadica). The spine divides this margin into two 

 parts, one of which forms the posterior half of the greater sciatic 

 notch, already described, while the other forms a similar, and, in 

 the rabbit, scarcely less extensive, posterior depression, the lesser 

 sciatic notch (incisura ischiadica minor). 



The superior or acetabular ramus of the ischium is the con- 

 tinuation backward of the body of the bone. It is a somewhat 

 flattened plate of bone, the thicker dorsal portion of which ter- 

 minates in two blunt projections. One of these, the ischial 

 tuberosity (tuber ischiadicum) , forms the posterior end of the 

 bone, while ther other extends in a lateral direction and is described 

 as the lateral process (processus lateralis). The inferior or 

 symphseal ramus is that part of the ischiurn which extends from 

 the superior ramus downward and forward between the obturator 

 foramen and the symphysis to meet the corresponding ramus of the 

 pubis. 



