140 



THE SKELETON 



this surface iov\w^ tlie posterior l)oun(larv of tlie obturator foramen. The inner 

 surface of the ischium gives origin to the obturator internum. The posterior surface 

 of the ischium Hes lietween the posteritjr rim of the acetahuhmi and the greater 

 sciatic notcli. Inferiorly this surface is limited by the obturator groove, which 

 receives the }xisterior Hesliy liorder of the obturator externus when the thigli is flexed. 

 The capsule of the hip-joint is attached to the outer part of the posterior svirface. 

 The ])i/rifonnis, the greater and lesser sciatic nerves, the sciatic artery, and the 



Fig. 151. — The Left Hip-bone. (luterual suilace.) 



Quadratus lumboruin 



Erector spmae 



Multifldus 

 spinae 



AURICUUR SURFACE 



POST. INF. SPINE OF 

 ILIUM 



ANT. INF. SPINE OF ILIUM 



Psoas miuor 



i-io-PuBAL Rioae 



GROOVE FOR PUDIC 

 VESSELS AND 



NERVE 



Ot. Bacro-BCiatic 

 ligament 



3:i00VE FOR OBTURATOR 

 NERVE AND VESSELS 



SYMPHY3IAL SURFACE 

 Levator ani 



''"'AiJn°i'irm,ru^^^ S.^"* P^°'« "°<* Compressor Subpubic 

 ANU IbCHIUM i-reetor penis ureihr£e ligament 



nexje to the c,uaclrat»sfemoris, cross it. The inner l)ordcr assists tlic ihum to com- 

 plet." till- greater sciatic notch, which is terminated inferiorlv bv the prominent 

 ischiatic spine, wl.i.h gives attacliment to the lesser sacro-sciatic ligament, the 

 levator a>u,imd rocn/!,ms. From the base of the spine, posteriorly, the gemellas 

 mperwr arises; and the internal pudic vessels and nerve, with the nerve to the 

 obturator mternus, cross it. The recess below the ischiatic spine is the lesser 

 sciatic notch ; in the recent state it is covered with cartilage, and presents two, 

 three, or four grooves for the tendinous under surface of the obturator internum muscle. 



