Anal anatomy and normal histology
Priti PandeyDepartment of Anatomy, School of Medical Sciences, Faculty of Medicine, University of NSW, Sydney, NSW 2052, Australia. Email: p.pandey@unsw.edu.au
Sexual Health 9(6) 513-516 https://doi.org/10.1071/SH12034
Submitted: 22 March 2012 Accepted: 29 July 2012 Published: 27 November 2012
Abstract
The focus of this article is the anatomy and histology of the anal canal, and its clinical relevance to anal cancers. The article also highlights the recent histological and anatomical changes to the traditional terminology of the anal canal. The terminology has been adopted by the American Joint Committee on Cancer, separating the anal region into the anal canal, the perianal region and the skin. This paper describes the gross anatomy of the anal canal, along with its associated blood supply, venous and lymphatic drainage, and nerve supply. The new terminology referred to in this article may assist clinicians and health care providers to identify lesions more precisely through naked eye observation and without the need for instrumentation. Knowledge of the regional anatomy of the anus will also assist in management decisions.
Additional keywords: anal cancer, anus, human papillomavirus, rectum.
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