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Proctodeum
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<p>A proctodeum is the back <a href="/facts/Germ_layer/eSUTuH7F">ectodermal</a> part of an <a href="/facts/Alimentary_canal/nK2zwqBS">alimentary canal</a>. It is created during <a href="/facts/Embryogenesis/1lFY4EoW">embryogenesis</a> by a folding of the outer body wall. It will form the lower part of the <a href="/facts/Anal_canal/rIh1hWx2">anal canal</a>, below the <a href="/facts/Pectinate_line/x71W1asG">pectinate line</a>, which will be lined by <a href="/facts/Stratified_squamous_epithelium/RLlp5jnr">stratified squamous non-keratinized</a> (zona hemorrhagica) and <a href="/facts/Stratified_squamous_epithelium/RLlp5jnr">stratified squamous keratinized</a> (zona cutanea) epithelium. The junction between them is <a href="/facts/Hilton%2527s_white_line/sNcrh8ED">Hilton's white line</a>. </p>