Anal sinus

Anal Sinus

The anal sinus is a small, tubular cavity located in the anorectal region of the human body. It is an integral part of the digestive system, playing a crucial role in the expulsion of waste from the body.

Anatomy[edit | edit source]

The anal sinus is situated in the anal canal, a short tube at the end of the rectum through which stool leaves the body. The anal sinus is lined with a type of columnar epithelium, which is a layer of cells that forms a barrier between the inside of the anal canal and the rest of the body.

Function[edit | edit source]

The primary function of the anal sinus is to aid in the expulsion of feces from the body. The anal sinus, along with the anal glands, secretes mucus that helps lubricate the anal canal, facilitating the passage of stool.

Clinical Significance[edit | edit source]

Conditions affecting the anal sinus can cause discomfort and potentially serious health problems. These conditions include anal abscess, anal fistula, and anal cancer.

An anal abscess is a painful condition caused by a collection of pus near the anus. It can occur when the small glands inside the anus become blocked.

An anal fistula is a small tunnel that develops between the end of the bowel and the skin near the anus. It's usually the result of an infection near the anus causing a collection of pus (abscess) in the nearby tissue.

Anal cancer, though less common, is a serious health condition that can occur in the anal sinus. It is often associated with human papillomavirus (HPV) infection.