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.

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