Proctodeum

A proctodeum is the back ectodermal part of an alimentary canal.

It is created during embryogenesis by a folding of the outer body wall.

It will form the lower part of the anal canal, below the pectinate line, which will be lined by stratified squamous non-keratinized (zona hemorrhagica) and stratified squamous keratinized (zona cutanea) epithelium.

The junction between them is Hilton's white line.

This developmental biology article is a stub.