THE INNOMINATE BONE. 



335 



line starts from the spine and runs obliquely backward and outward to the ilium. 

 The triangular ancero-superior side of the ramus, narrow at the inner end, broad at 

 the outer, concave from side to side, convex from before backward, is bounded 

 behind by the ilio-pectineal line, in front by the obturator crest, ^ which runs from the 



Fig. 354. 



\^\\\\\f 



Conjoined tendon 

 Gimbernat's liga 

 Poupart's 1 



Conjoined tendon 



Obturator crest 

 e of pubis 



Ilio-pectineal eminence 



Rectus abdominis Pyramidalis 



Region of symphysis pubis from above. 



spine to the inner border of the acetabular notch, and externally by a swelling at the 

 upper inner part of the socket, — the ilio-pectineal eminence. The posterior side, broad 

 at the inner end and narrow at the outer, is quite smooth. The inferior border is 

 marked by the broad obturator groove' above the foramen, passing from behind for- 



FiG. 355. 



Epiphyseal lamina on ilium 



Os acetabuli 



nodules 



Epiphyseal lamina on ischium 



Innominate bone at about fifteen years. 



ward and inward for the obturator vessels and nerve. The inferior ramus,=* flat 

 and thin, rough in front, smooth behind, extends backward and outward to join the 

 ramus of the ischium. It is constricted just above the point of union. The inner 

 edge, forming part of the pubic arch, is somewhat everted. 



' Crista obturatoria. - Sulcus obturatorins. ^ Ramus inferior. 



