48 



BOVINE OBSTETRICS 



these data rest upon an anatomical basis, that is, fixed points 

 of the pelvic canal, they are of some value. Many diameters, 

 considered from a practical standpoint, are of little importance; 

 the relative dimensions of some may be of theoretical and 

 practical value. As already mentioned, the inlet of the pelvic 

 canal has the shape of an ellipse, lying under an angle of 45°. 



a 



if* 



b 

 Fig. 11. 



a— 6, Vertical diameter of pelvic inlet, c—d. Greatest transverse diameter 

 of pelvic inlet. 



Fig. 12. — Section of pelvis with guiding line a-b. 



The long diameter of this ellipse runs from the promontory to 

 the symphysis pubis ; the short one indicates the greatest 

 width of the pelvic inlet, and runs between the ileo-pectineal 

 crests. 



Eranck terms the long diameter conjugata vera. This 

 name may be continued in considering the fact that it thus 

 designates this diameter in the human pelvis, although in the 



