Findings

In this medium-power view of the surface of the distal region of the anus, stratified squamous keratinized epithelium is evident. Here, the epithelium and underlying dense irregularly arranged connective tissue (dermis) are similar to that seen elsewhere in the skin.

Comment

In contrast to the moist mucous membrane of the rectoanal junction, the distal portion of the anus is a surface epithelium and therefore the outer cells lack nuclei and are cornified.

Preparation

Paraffin section, hematoxylin and eosin

View

Medium-power light microscopy

Specimen

Anus

Image Credit

V. Eroschenko, Ph.D.
Department of Biological Sciences
WAMI Medical Program
University of Idaho