Anus

 

The anus develops from both endoderm and ectoderm. Originally the cloaca is placed in front of the urorectal septum. The posterior aspect forms the hindgut and anus while the front forms certain urogenital organs. Somatopleuric mesoderm also takes part in the formation of the anus. The remaining part of the anus is formed from the anal pit which derived from ectoderm. It is the ectodermal part of the anus which is lined by stratified squamous epithelium that is the epithelium of the skin and anal pit. But the endodermal part forms the endoderm in line with the lining of the rest of the hind and mid gut.


Gut development video -Interactive video text

 

 

 

 

 

  

  

Oluwole Ogunranti 

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