So 



ELEMENTS OF MAMMALIAN ANATOMY. 



rounded angle of the crest is the anterior superior spine. 

 The anterior inferior spine is the small prominence 

 cephalad from the ventral termination of the auricular 

 surface. The posterior superior spine is the mesal pro- 

 jection on the mid-dorsal border of the ilium, forming 

 part of the auricular surface. 



ass. 



FIG. 38. LATERAL ASPECT OF LEFT 

 INNOMINATE BONE. 



ct, Cotyloid bone; ac, acetabulum; 

 il, ileo-pectineal eminence; as, 

 anterior inferior spine; a^, an- 

 terior superior spine. (Modified 

 after Jayne.) 



FIG. 39. VENTRAL ASPECT OF THE 

 INNOMINATE BONES. 



ac, Acetabulum ; ai, posterior infer- 

 ior spine ; ar, auricular surface ; cr, 

 crest ; ct, cotyloid notch ; ip, ileo- 

 pectineal eminence; is, body of 

 ischium; ob, obturator foramen; 

 pb, body of pubis; s, spine; sm, 

 symphysis pubis ; sp, spine of 

 pubis; sr, surface of ilium for 

 attachment of spinal muscles; 

 tb, tuberosity of the ischium. 



The ischium presents a spine on its dorsal border near 

 the acetabulum. Between this spine and the posterior 

 inferior spine of the ilium, is a shallow concavity termed 

 the greater sciatic notch in distinction to the lesser sciatic 

 notch between the spine of the ischium and the tuber- 



