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Rectum - Anatomy & Physiology (view source)
Revision as of 14:19, 12 July 2008
, 14:19, 12 July 2008→Structure
**Therefore the most distal part of the rectum is retroperitoneal.
**Therefore the most distal part of the rectum is retroperitoneal.
***This distal, retroperitoneal part is directly attached to the vagina in the female and to the urethra in the male.
***This distal, retroperitoneal part is directly attached to the vagina in the female and to the urethra in the male.
***The retroperitoneal space is filled with soft tissue rich in fat.
*The '''anal canal''' joins the bowel to the exterior.
*The '''anal canal''' joins the bowel to the exterior.
**This is a short passage derived from the proctodeum (formed by invagination of the surface ectoderm).
**This is a short passage derived from the proctodeum (formed by invagination of the surface ectoderm).
**Before joining the anal canal, the rectum becomes dilated to form the ''rectal ampulla''.
*At the rectoanal junction, the lumen is constricted by longitudinal folds in the mucosa.
*At the rectoanal junction, the lumen is constricted by longitudinal folds in the mucosa.
**These are normally pressed together to occlude the lumen.
**These are normally pressed together to occlude the lumen.