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**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.
  
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