直肠的粘膜面 Anorectal musculature Frontal section Superior fascia of pelvic diaphragm Inferior fascia of Circular muscle of rectum Muscularis mucosae of rectum Levator ani muscle Rectal fascia Deep extemal anal sphincter muscle Longitudinal muscle of rectum Intemal rectal venous plexus Conjoined longitudinal muscle Superficial extemal Intemal anal sphincter muscle anal sphincter muscle Musculus submucosa ani Transverse fibrous septum of ischiorectal Intermuscular groove (white line of Hiiton) Subcutaneous extemal anal sphincter muscle Ectemal rectal venous plexus Corrugator cutis ani muscle OCIEA-GEIGY直肠的粘膜面