OSTEOLOGY AND ARTHROLOGY 



lOI 



is plane, replaces the linea aspera, which in the horse, instead 

 of presenting the appearance of a crest, is considerably 

 widened. The numerous irregularities which this surface 

 presents give insertion to the muscles which correspond to 

 those attached to the linea aspera. 



Between this posterior surface and the external is found 

 a rough prominence which curves forward ; this was desig- 

 nated by Cuvier the third trochanter ; it replaces the external 

 branch of the superior line of bifurcation of the linea aspera ; 

 other authors call it the infratrochanteric crest, because it is 

 situated below the great trochanter. At the inferior part of 

 the same region is found a deep fossa, the borders of which 

 are rough ; this is the supracondyloid fossa. 



Fig ^2- — Pelvis of the Horse : Superior Surface. 



I, Iliac crest ; 2, external iliac fossa ; 3, sacruni ; A A', bi-iliac diameter ; 



BB', bi-ischiatic diameter. 



Between the posterior surface and the internal are found : 

 above, the lesser trochanter, which is long and rough ; 

 below, at the level of the supracondyloid fossa, an equally 

 rough surface known by the name of the supracondyloid 

 crest. 



The superior extremity is flattened from before backwards. 

 The neck is not well marked. The great trochanter is very 

 prominent, and projects beyond the level of the head of the 

 femur. We divide the great trochanter into three parts : 

 the summit, which is the most elevated portion ; the con- 



