290 



PRACTICAL ANATOMY. 



digitations. (Fig. 199.) It leaves the pelvis by the greater sacro-sciatic fora- 

 men, dividing this into an upper and a lower compartment, and is inserted into 



PyriformiB 



TUBEROSITV 



Coccygeus 



CoccygeuB 



Levator An! 



FIG. 199. THE SACRUM AND COCCYX. (Anterior view.) 



SACRUM 



Pyriformia 



Levator ani (divided 

 below the ' white line ') 



Space for obturator 

 interims 



Passage for ghileat 

 vessels and nerve 



PyriformiB 

 Passage for sciatic 



tnui }>n<lic vessels 



nail nerve 

 ISCHIAL SPINE 



Coccygeus 

 Cellular interval 

 Levator ani 



Capsule of prostate, 

 and pubo-prostatic 

 ligaments 



FIG. 200. MUSCLES OF THE FLOOR OF THE PELVIS. 



the upper border of the greater trocliantcr. It is an external rotator of the 

 thigh. Its nen'c-sitpply is from the sacral plexus. 



The Coccygeus extends from the spine of the ischium to the anterior surface 



