126 



THE SKELETON OF THE LOWER EXTREMITY 



Spinous process of the fifth lumbar vertebra 



Processus spinosus vertebrae lumbalis V. 



Rough surface behind 

 the posterior gluteal 



^Jx^i 



line for the attachment 

 of the gluteus maximus 

 *Tuberositas iliaca 



Posterior superior 

 spine of the ilium 



Spina iliaca pos 

 terior superior 



Posterior inferioi -' 



spine of the ilium 



Spina iliaca pos- 

 terior inferior 



Spine of the ischium 

 Spina ischiadica 



Great trochanter 

 Trochanter major 



Ilium 



Os ilium 



Sacrum (posterior 

 surface) 



Os sacrum (facies 

 dorsalis) 



Coccyx 



Os coccygis 



Ischium 



Os ischii 



Tuberosity of the 

 ischium 



Tuber ischiadicum 



FIG. 308. PELVIS VIRILIS THE MALE PELVIS. POSTERIOR ASPECT. 



The pelvic outlet, apertura pelvis (minoris) inferior, in the bony pelvis appears to be bounded on either 

 side by the lower borders of the pubis and the ischium and the greater and lesser sciatic notches 

 incisura? ischiadica; major et minor, and behind by the projecting part of the sacrum and by 

 the coccyx. But inasmuch as on either side there are two strong ligaments arising from the 

 sacrum and coccyx, the great and the small sacrosciatic ligaments, ligamenta sacrotuberosum 

 et sacrospinosum, which stretch across the two sciatic notches, and thus enlarge the posterior 

 and lateral walls of the true pelvis, by this means the sciatic notches are filled in and the outlet 

 of the pelvis is notably diminished in size. 



Cinguium extremitatis inferiorls Pelvic girdle. 



