THORAX AND ABDOMEN OF THE HORSE 



91 



Though the abdominal cavity is one and continuous, for descriptive 

 purposes it is necessary to divide it into the cavity of the abdomen proper 



and the cavity of the pelvis. The distinction between these is that the 

 latter is contained within the hip-bones, and, therefore, is possessed of a 

 complete bony ventral wall. The plane of separation between the 



