【正文】
this diaphragm is the anal canal. The lower portion of the pelvic part of rectum is frequently more distended than the remainder, and is known as the ampulla of rectum. Structure of the rectum amp。 anal canal Prineopelvic spaces ( 2) (2) (1)(骶前間隙 ) 共五個間隙 Blood vessels Lymphatic drainage Innervation