20 



OBSTETRICAL ANATOMY. 



turned outwards, and the two portions of the floor of the canal are 

 directed very obliquely downwards and inwards. In the Mare the 

 ischial arch is wider than in the Horse, and forms a regular curve in 



Fig. 1.3. 

 Bones of Pelvis op Mare. 



joining the tuber ischii ; while in the Horse these tuberosities are not 

 nearly so wide apart, and the ischial arch forms a somewhat acute 

 angle, the margin of which is nearly straight. The obturator foramina 



Fig. H. 

 Bones of Pelvis of Horse. 



are also large and almost circular in the Mare, while they are small and 

 oval in the Horse ; the ischio-pubic symphysis is farther from the 

 cotyloid cavities in the former than in the latter. 



The sacrum is also broader and longer in the Mare, and in the 



