1 6 4 Mtifcles-of the Pelvis, '&c. [Book I3f. 



the ileum, and is inferted into the tranfverfe procefles 

 of all the lumbar ve'rtebrse, into the laft rib near tjie 

 fpine, and by a fmall tendon into the fide of the laft 

 vertebra of the back. Its ufe is to draw the loins 

 to one fide, or, when both aft, to bend the loins 

 forwards towards the ileum. 



Within the pelvis are placed the obturator internus,. 

 which arifes from 'the internal circumference of the 

 foramen thyroideum. Its tendon paries out of the 

 pelvis, between the pofterior facro-ifchiatic ligament 

 and the tuberofny of the os ifchium, and is inferted 

 into the large pit at the root of the trochanter ma- 

 jor. Its effect is to roll the os femoris obliquely out- 

 wards. 



The coccygeus pafTes from the fpinous procefs of 

 the ifchium to the bottom of the os facrum, and the 

 whole length of the os coecygis.- By Its contraction the 

 os coecygis is drawn forwards. 



Belonging to the anus are, 



The fphincter ani, which arifes from the fkin and 

 fat which furround's the verge of the anus. The fibres 

 are gradually collected into an oval form, and fur- 

 round the extremity of the rectum, which they ferve to 

 contract. 



The levator ani arifes from the os pubis, within the 

 pelvis, and from the fpinous procefs of the ifchium. It 

 is inferted into the fphincter ani, acceleratores uring?, 

 and the point of the os coecygis, It furrounds the 

 extremity of the re&um and the neck of the bladder, 

 fo that joining with its fellow, they together very much 

 referable the fhape of a funnel It fupports and draws 

 the rectum. 



