Anal sinuses

2020-05-23 00:37:16

The anal sinuses are furrows in the anal canal, that separate the anal columns from one another. The anal sinuses end below in small valve-like folds, termed anal valves.

The anal sinuses are furrows in the anal canal, that separate the anal columns from one another. The anal sinuses end below in small valve-like folds, termed anal valves.
Read article on Wikipedia