92 



THE BONES. 



Faces.— The external or superior face, studded with some muscular 

 imprints, is excavated on both sides, and is named the external tliac /osssa. 

 The internal or inferior face offers for study: 1, An external portion, 

 smooth, and crossed by some vascular grooves; this is the iliac surface, 

 which is replaced in Man by an excavation called the miirnal iliac fossa ; 

 2, An internal portion, roughened and uneven, presents, posteriorly, the 

 auricular facet, an irregular diarthrodial surface, elongated from side to 

 side, a little oblique in front and inwards, and responding to an analogous 

 surface on the sacrum. . ,. , ,, 



Borders The anterior border, or crest of the Hium, is slightly concave, 



Fig. 58. 



THE coXjE; seen from below, 



1, Iliac surface ; 2, Auricular facet; 3, Angle or crest of the ilium; 4, Angle 

 of the haunch ; 5, Cotyloid cavity ; 6, Its bottom ; 7, One of the imprints 

 for the insertion of the anterior straight muscle of the thigh (rectus femoris); 

 8. llio-pectineal ridge ; 9, Channel on the external face of the pubes ; 10, Oval 

 (or obturator) foramen; 11, Ischial spine ; 12, 12, Ischial arch. 



and bears a roughened lip for muscular insertion. The external border is 

 thick, concave, and furrowed by vascular fissures ; it presents, inferiorly, {he 

 nutrient foramen The internal border is thin and concave, particularly in 

 its po&terior part, which constitutes the great iscMatic notch. 



Angles. — The external angle, or anterior and superior spinous process, is 

 thick, wide, and flat, and bears four tuberosities : two superior and,ytwo 

 inferior, The internal angle, or posterior and superior spinous process, 

 represents a rugged tuberosity curved backwards and upwards^' ! The 



(' At the external angle of the ilium, 1here is sometimes found in the horse a process — . 

 often a very marked one — directed downwards, and completely enveloped by the external 

 ilio-femoral muscle.) 



