Histology of the rectum

Histological structure of the perineal and the upper part of the rectum is very different. Cover perineal part is a continuation of the skin, but is devoid of hair, sebaceous and sweat glands, and epidermal part thinned to 4-5 layers of cells instead of 15-20. The mucous membrane of the rectum contains tubular glands (glandulae intestinales) and lymph follicles (folliculi lymphatici). Submucosal layer is very rich in blood and lymph vessels. Muscular layer, the most thick, made up of an inner circular and outer longitudinal fibers. Serous cover consists of a single mesothelial tissue and 4 - 5 thin elastic fibers.
Physiology rectum - see Defecation.