Chapter 36: The rectum and anal canal Rectum At the level of the middle of the sacrum, the sigmoid colon loses its mesentery and gradually becomes the rectum, which
Anatomy > Rectum and muscles The external anal sphincters and internal anal sphincters surround the anal canal. The internal sphincter is a smooth muscle ring at
Anal sphincter anatomy. Toggle: English / Spanish. Version Info. Last reviewed on 6/18/2012; Linda J. Vorvick, MD, Medical Director and Director of Didactic
The external anal sphincter (or sphincter ani externus) is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the skin
PURPOSE: To describe the various patterns of normal sphincter anatomy as seen at endoanal magnetic resonance (MR) imaging and to assess sex- and age-related
The lower anal canal and the anal opening are composed of two muscular constrictions that regulate fecal passage. The internal sphincter is part of the inner surface
WebMD provides a medical diagram of the anus and explains its Circular muscles called the external sphincter ani form the wall of the anus Anal fistula: An
Check out this image and learn more on MedlinePlus: Anal sphincter anatomy
Jun 28, 2016 ยท The external anal sphincter is composed of skeletal muscle, Sections Anal Canal Anatomy. Gross Anatomy; Tissue, Nerves, and Muscles;
Ano-Rectal Anatomy. The pelvic diaphragm, The external anal sphincter is a voluntary sphincter innervated primarily by S4 through the inferior rectal nerve.