anal duct

anal duct

A long tubular structure lined by transitional or stratified columnar epithelium, which approaches or penetrates into the internal sphincter muscle and may underlie the rectal mucosa.
References in periodicals archive ?
Although the original WHO classification listed this tumor under the category "adenocarcinoma of anal glands," these tumors may actually arise from or be related to anal ducts that drain the anal glands, and may therefore be more appropriately termed anal duct adenocarcinoma.
Moreover, carcinomas associated with anal fistulae are often mucinous, and it remains to be determined if at least some of such fistula-associated tumors are actually of anal gland or anal duct origin.
7) In addition, the anal ducts that drain anal glands open in the ATZ (Figure 3).