Difference between revisions of "Anus - Anatomy & Physiology"
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==Histology== | ==Histology== | ||
| − | [[Image:Anal | + | [[Image:Anal Glands.jpg|thumb|right|150px|Anal Glands- Copywright RVC 2008]] |
*At the anus, the columnar intestinal epithelium is replaced by the stratified squamous keratinised 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: | ||
Revision as of 14:48, 14 July 2008
Introduction
Structure
Function
Vasculature
Innervation
Lymphatics
Histology
- 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:
- Columnar
- Has many longitudinal folds.
- Divided from the rectum by the anorectal line.
- This is a line where the mucosa is stratified squamous epithelium containing lots of lymphoid tissue.
- Intermediate
- Divided from the cutaneous zone by the anocutaneous line.
- Cutaneous
- Skin.
- Stratified squamous keratinised epithelium.
- Surrounds the anus.
- Excretory ducts of the anal sacs open into this region.
- Large, coiled apocrine tubules.
- Have many glands in their walls.
- These glands are tubuloalveolar and produce a fatty secretion.
- Anal sacs are clinically important as they are commonly diseased in dogs - frequently, they become enlarged due to accumulated secretion.
- Columnar