THE POSTERIOR LIMBS. 



129 



Borders. — The anterior is constituted by a thin rugged lip, which is curved 

 upwards. The posterior, thick and concave, circumscribes anteriorly a wide 

 opening, the oval, suhpiiUc, or obturator foramen ; it is channeled near the coty- 



Fig. 84. 



PELVIS (ANTERO-LATERAL VIEW). 



1, Anterior iliac spine ; 2, posterior iliac spine ; 3, shaft of the ilium, with the ilio-pectineal crest ; 

 4, cotyloid cavity ; 5, symphysis pubis ; 6, inferior ischiatic spine and tuberosity. 



loid angle by a fissure which runs obliquely inwards and downwards. The 

 internal is united with that of the opposite bone, to form the pubic portion of 

 the pelvic symphysis. 



Ayigles. — The ex- Fig- 85. 



ternal, also named the 

 cotyloid angle, is the 

 thickest of the three. 

 To it chiefly belongs 

 the rugged depressed 

 surface that constitutes 

 the bottom of the coty- 

 loid cavity. The in- 

 ternal unites with the 

 analogous angle of the 

 opposite bone. The 

 •posterior is consolidated 

 at an early period with 

 the antero - internal 

 angle of the ischium, to 

 enclose, inwardly, the 

 oval foramen. 



Ischium (Figs. 84, 

 85). — This is the mean, 

 in volume, of the three 

 pieces of the coxa. Situated behind the pubis and ilium, it is flattened above 



PELVIS (LATERAL VIEW). 



1, External angle of the ilium, or anterior iliac spine ; 2, internal 

 angle, or posterior iliac spine ; 3, shaft of the ilium and ilio- 

 pectineal line ; 4, cotyloid cavity, or acetabulum ; 6, inferior 

 ischiatic spine, with tuberosity behind. 



