Anatom3DAnus
Anus · Řitní otvor
Digestive system
Looks like
The opening at the end of the gut, about 3–4 cm of canal ringed by muscle, between the buttocks.
What it does
Lets stool out under control.
Keeping it well
Fissures from hard stools cause sharp pain on passing stool; a lump, persistent itch or bleeding that does not settle needs examining.