The anal valves are small crescent-shaped folds joining the lower ends of the anal columns, and behind each valve is a tiny pocket called an anal sinus (crypt). Together they form the wavy pectinate line.
| Location | At the pectinate line, about halfway along the anal canal |
|---|---|
| Parts |
|
| Nerve Supply | Junction of visceral and somatic (inferior rectal nerve) supply |
| Blood Supply | Superior and inferior rectal arteries |
| Venous drainage | |
| Lymphatic drainage |
|
The sinuses collect mucus from anal glands, which helps lubricate the passage of stool.
Anal glands opening into the sinuses can become blocked and infected, which is the usual cause of perianal abscess and fistula. The pectinate line they form is the dividing line for blood, nerve and lymph supply of the canal.
Infection of an anal gland spreading into surrounding tissues, causing severe pain and swelling.
An abnormal tunnel from an anal crypt to the skin, often after an abscess.
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