1,362
edits
Changes
Rectum - Anatomy & Physiology (view source)
Revision as of 15:00, 14 July 2008
, 15:00, 14 July 2008→Structure
**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''.
**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.