出典:Wiktionary
From Ancient Greek πρωκτός (prōktós, “rectum”) with ὁδαῖος (hodaîos, “on the way”), of ὁδός (hodós, “way, road”).
出典:Wikipedia
出典:『Wikipedia』 (2010/06/01 13:18 UTC 版)
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.