Anus

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Anus
Protovsdeuterostomes.svg
Formation o anus in proto- an deuterostomes
Details
PrecursorProctodeum
SystemAlimentary, sometimes reproductive
ArteryInferior rectal artery
VeinInferior rectal vein
NerveInferior rectal nerves
LymphSuperficial inguinal lymph nodes
Identifiers
LaitinAnus
TAA05.7.05.013
FMA15711
Anatomical terminology

The anus (frae Laitin anus, meanin 'ring, anus', which is frae Proto-Indo-European *h₁eh₂no-, meanin "ring") is an openin at the opposite end o an ainimal's digestive tract frae the mooth. Its function is tae control the expulsion o faeces, unwantit semi-solit matter produced during digestion.