152 



SKELETON OF THE OX 



little forward. The anterior border is marked by a transverse groove which ends 

 below the rough ilio-pectineal eminence. The sjonphyseal branch is wide and 

 bhin. 



The acetabulum is smaller than in the horse. The rim is rounded and is 

 usually marked by two notches. One of these is postero-medial and is narrow 

 and deep; it leads to the deep acetabular fossa and is often almost converted 

 into a foramen by a bar of bone. The other notch is antero-medial, small, and 

 sometimes replaced by a foramen or absent. 



The obturator foramen is large and elliptical. Its medial border is thin and 

 sharp. 



Fusion of the three bones occurs at seven to ten months. 



The pelvic inlet is elliptical and is more oblique than in the horse. In a cow 



Median 

 Wing of crest of Tuber 

 sacrum sacrnm sacrale 



Aaiabidum 

 Tuber ischii 



Ilio- pectineal eminence 



Symphysis pubis 



Obturator foramen 



1 'entral ridge 

 Fig. 154. — Pelvic Bones of Cow. Viewed from in Front and Somewhat from Below. 



of medium size the conjugate diameter is about nine and a half inches (ca. 23 to 24 

 cm.), and the transverse diameter about seven inches (ca. 18 cm.). The anterior 

 end of the symphysis lies in a transverse plane through the junction of the third and 

 fourth sacral segments. The dorsal wall or roof is concave in both directions. The 

 ventral wall or floor is deeply concave, particularly in the transverse direction. 

 The cavity is narrower and its axis is inclined strongly upward in the posterior part. 

 The distance between the acetabulum and the tuber coxse is only a little (ca. 3 to 

 4 cm.) more than the distance between the former and the tuber ischii. 



The femur has a relatively small shaft, which is cylindrical in its middle, pris- 

 matic distally. The trochanter minor has the form of a rough tuberosity, and is 

 situated higher up than in the horse and encroaches on the posterior surface. The 

 trochanteric ridge (Crista intertrochanterica posterior) connects it with the tro- 



