AND PHYSIOLOGY. 



61 



187. Bones of the Pelvis. — The bones of the Pelvis are 

 the two Innominata or nameless bones, and the Sacrum and 

 Coccyx, which have already been described. (Fig. 78.) 



Fig. 18. 



188. The InnomiMtam, Ilium, Ischium, Tubes. — Each 

 Innominatum presents the largest surface of any bone in the 

 body. They are irregularly flat bones and situated just 

 beneath the abdomen, to the organs of which they give firm 

 support by their broadly-expanded surface. In young skele- 

 tons they are divided into three portions, and hence they are 

 described in the adult as made up of three parts, although no 

 line of division can actually be seen. The Ilium constitutes 

 the broadly-expanded portion usually known as the hip or 

 haunch. The Ischium, from the Greek signifying to " hold" 

 or u retain," is the heavy portion projecting downwards, and 

 that point on which the body rests, when in a sitting posture. 



1ST. IIow many bones in the Pelvis, find what are their names? 133. Describe the 

 Innominatum. Into how many parts are they divided in young animals? Describe 

 the Ilium and the Ischium. 



