94 



THE SKELETON OF THE HORSE 



The anterior border or crest (Crista iliaca) is concave, thick, and rough. 



The internal border is deeply concave; its middle part forms the lower bound- 

 ary of the great sciatic foramen, and it is continuous behind with the superior 

 ischiatic spine. 



The external border is concave and in great part rough. Its fore part is 

 crossed by grooves for the ilio-lumbar vessels, which are continued on the pelvic 

 surface. The nutrient foramen is usually situated on or near the posterior part of 

 this border. 



The internal or sacral angle (Tuber sacrale) curves upward and a little back- 



FiG. 61. — OssA CoxARtTM OF Mare, Ventral View. 

 D, Ilium; Sch., pubis; ;S', ischium; a, anterior border (crest) of ilium; b, internal angle of ilium; c', 

 external angle of ilium; d, great sciatic notch; e, external border of ilium; /, iliac surface; g, linea arcuata; h, 

 rough ligamentous area; i, auricular surface; k, ilio-pectineal line; I, psoas tubercle; ?«, transverse branch, ami 

 n, symphyseal branch of pubis; o, o' , symphysis pelvis; p, anterior border of pubis (pecten); g, tuberculum pubi- 

 cum; r, ilio-pectineal eminence; s, tuber ischii; t, ischial arch; ;/, lesser sciatic notch; v, acetabular branch, and 

 w, symphyseal liranch of ischium; r, obturator foramen; ?/, articular surface of acetabulum; z fossa acetabuli; 

 i, groove for ilio-luinbar artery; 2, groove for iliaco-feiuoral artery; ,i. subpubic groove; 4< depression for inner 

 tendon of origin of rectus femoris; o, rough area for attachment of adductor muscles. (Ellenberger-Baum, Anat. 

 d. Haustiere.) 



ward close to the first sacral spine, and forms here the highest point of the skeleton. 

 It is somewhat thickened and rough. 



The external or coxal angle (Tuber coxa?) forms the basis of the point of the 

 hip. It is a large quadrangular mass, narrow in its middle, and enlarged at either 

 end, where it liears a pair of tuberosities. It is roughened for muscular attachment. 



The posterior or acetabular angle meets the other two bones at the acetabu- 

 lum, of which it forms about two-fifths. Its prominent upper border forms part 

 of the superior ischiatic spine, which is roughened externallj^, smooth internally. 

 Two depressions above and in front of the acetaliulum give attachment to the 



