PELVIS MINOR 



437 



fibrous tissue which fills the interval between the coccyx and 

 the anus. It receives the insertion of some of the fibres of 

 the levatores ani muscles. Below the pelvic floor, in the 



Posterior 



superior' 



spine of ilium 



Rectui 



Lig. sacro- J 



tuberosum / 1 m 



Ischio-rectal 



fossa 



Anal canal 



Anus- 



4th sacral 

 vertebra (cut) 

 Piriformis 

 (cut) 



FlG. 204. Dissection of the Rectum from behind. The sacrum below the 

 4th sacral vertebra and also the coccyx have been removed. Portions 

 of the levatores ani, coccygei, and external sphincter have also been 

 taken away. (Birmingham.) 



region of the ano-coccygeal body, lies the posterior part of 

 the sphincter ani externus muscle. 



Peritoneal Relations of the Rectum. These relations are 

 of practical importance. In its upper third the gut is clothed 



n--28a 



