' 8 VETERINARY OBSTETRICS. 



which the sacro-sciatic ligament is fixed. Below the 

 cavity, and inclining- Inwards, is a large circular open- 

 ing, occupied by the obturator muscles and known as. 

 the foramen ovale, or obturator foramen. The two- 

 ossa innominata are united in the middle line inferiorly 

 and posteriorly by a solid suture — the symphysis- 

 pubis, or ischio-pubic symphysis. Above they articulate 

 with the sacrum. 



Fig. I. 



Pelvis of the Mare. 



A, Ilium; B, Pubis; C, Ischium; D, Foramen Ovale; E, Tuberosity of th& 

 Ischium; F, Cotyloid Cavity. 



The OS innominatum is composed of three portions, 

 uniting at the acetabulum, and have received the names r 

 the ilium, ischium, ■asid^ pubis. 



The ilium, hip, or haunch, is the largest of the three- 

 bones. It is irregularly triangular in shape, and is. 

 directed obliquely downwards, inwards and backwards, 

 and has two faces, three borders, and three angles. 

 The external face presents the external iliac fossa ; 

 the internal face the iliac surface, and an auricular 



