The anal canal is the terminal part of the large intestine. In humans it is approximately wikipedia. It lies in the anal triangle of perineum in between the right and left ischioanal fossa.
The anal canal is the short terminal portion of the wikipedia chineseporn with black which wastes from the large intestine are excreted from the body. The ring at the terminal portion of the anal canal is called the anus. The anal canal is between 2. The external anal sphincter muscle is the voluntary muscle that surrounds and adheres to the anus at the lower margin of the anal canal.
This muscle is in a state of tonic contraction, but during defecation, it relaxes to allow the release of feces. Movement of the feces is also controlled by the involuntarily controlled internal anal sphincter which an extension of the circular muscle surrounding the anal canal. It relaxes to expel feces from the anal and anal canal. Anal canal is divided into three parts. The zona columnaris is the upper half of the canal and is lined by simple columnar epithelium.