But some say this anal aversion has bled over to the world of science, where anus-related studies are sometimes avoided. This makes nailing down the origin of the body part extra complicated. Some animals with simple digestive tracks only have one opening in their body for both consumption and excretion. Andreas Hejnol and Dr. The "deep origin" of the organ is still a mystery, though, Hejnol says. Subscribe or Give a Gift.
The anus from Latin anus meaning "ring", "circle" is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces , unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may include: matter which the animal cannot digest, such as bones ;  food material after all the nutrients have been extracted, for example cellulose or lignin ; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts. Amphibians, reptiles, and birds use the same orifice known as the cloaca for excreting liquid and solid wastes, for copulation and egg -laying. Monotreme mammals also have a cloaca, which is thought to be a feature inherited from the earliest amniotes via the therapsids.
[Portable Video Electronic Anus Diagnosis Instrument Based on DaVinci Technology].
Sign in. See the list. Title: Solar Anus Cinema Video
Now that Cluck the kitten is through her crowdsourced surgery, she is waiting to see if her new butthole works. As we know, everyone poops, so everyone needs an anus. Thanks to countless cat lovers out in the world, the rescue was able to raise the money and schedule Cluck for surgery. After waiting for the kitten to grow a little bit stronger, doctors put her under the knife for a complicated operation, which, in the end, resulted in a new anus for the little angel.