BONES OF THE PELVIC LIMB 



151 



edge from the volar surface. The angle is very short and blunt, and there is no 



Four proximal sesamoids are present, two for each digit. They are much 

 smaller than m the horse. The bones of each pair articulate with the correspond- 

 ing part of the distal end of the large metacarpal bone by their dorsal surfaces, 

 with each other and with the first phalanx by small facets. 



.u ^^fJ^° ^'^^^^ sesamoids are short and their ends are but little narrower than 

 the middle. 



BONES OF THE PELVIC LIMB 



+ ^T^^ ^^ ^^® '^^'^°®* parallel to each other and are also less oblique with regard 

 to the horizontal plane than in the horse. They are relatively small. The gluteal 

 hne IS prominent and is nearly parallel to the lateral border; it joins the ischiatic 

 spine. A rounded ridge separates the two parts of the pelvic surface. The surface 



Tuber sacrale ' 



Tuber inchii 



Ischium 



Acetabulmn 



Ridge Obturator- Pubis 

 foramen 



Fig. 153. — Right Os Cox.-e of Ox; Lateral View. 

 1, Gluteal line; 2, fossa acetabuli. 



for articulation with the sacrum is triangular. The tuber sacrale is truncated, does 

 not extend as high as the vertebral spines, and is separated from the opposite angle 

 by a wider interval than in the horse. The tuber coxae is relatively large and prom- 

 inent; it is not so oblique as in the horse, and is wide in the middle, smaller at either 

 end. The shaft is short and compressed from side to side. 



The ischium is large. Its long axis is directed obliquely upward and back- 

 ward, forming an angle of about 45 to 50 degrees mth the horizontal plane. The 

 transverse axis is oblique downward and inward at a similar angle, so that this 

 part of the pelvic floor is deeply concave from side to side. The middle of the 

 ventral surface bears a rough ridge or imprint for muscular attachment. The 

 ischiatic spine is .high and thin, and bears a series of almost vertical rough lines 

 laterally. The tuber ischii is large and three-sided, bearing dorsal, ventral, and 

 lateral tuberosities. The ischial arch is narrow and deep. The symphysis bears a 

 ventral ridge, which fades out near the ischial arch. 



The acetabular branch of the pubis is narrow, and is directed laterally and a 



