Changes

==Histology==

==Histology==

*At the anus, the columnar intestinal epithelium is replaced by the stratified squamous epithelium of the skin.

*At the anus, the columnar intestinal epithelium is replaced by the stratified squamous keratinised epithelium of the skin.

*As the muscosa changes from columnar to cutaneous, three zones are created:

*As the muscosa changes from columnar to cutaneous, three zones are created:

**'''Columnar'''

**'''Columnar'''