The anus and anal canal
The anus and anal canal
The anal canal starts at the level where the rectum passes through the pelvic diaphragm, where the rectal ampulla suddenly narrows, and ends at the anal verge. The muscular junction between the rectum and anal canal can be felt with the finger as a thickened ridge called the anorectal ring. The puborectalis muscle maintains the angle between the anal canal and rectum and is an important component in the continence mechanism. The external sphincter forms the bulk of the anal sphincter complex and, although traditionally it has been subdivided into deep, superficial and subcutaneous portions, it is a single muscle, which is variably divided by lateral extensions from the longitudinal muscle layer. The longitudinal muscle is a direct continuation of the smooth muscle of the outer muscle coat of the rectum, augmented in its upper part by striated muscle fibres originating from the medial components of the pelvic floor.
1417-1446
West, Malcolm A.
98b67e58-9875-4133-b236-8a10a0a12c04
Nugent, Karen P.
79fcb89d-6ff2-47b8-ac2c-2afb24954456
30 March 2023
West, Malcolm A.
98b67e58-9875-4133-b236-8a10a0a12c04
Nugent, Karen P.
79fcb89d-6ff2-47b8-ac2c-2afb24954456
West, Malcolm A. and Nugent, Karen P.
(2023)
The anus and anal canal.
In,
O'Connell, P. Ronan, McCaskie, Andrew W. and Sayers, Robert D.
(eds.)
Bailey & Love's Short Practice of Surgery - 28th Edition.
28 ed.
.
(doi:10.1201/9781003106852-91).
Record type:
Book Section
Abstract
The anal canal starts at the level where the rectum passes through the pelvic diaphragm, where the rectal ampulla suddenly narrows, and ends at the anal verge. The muscular junction between the rectum and anal canal can be felt with the finger as a thickened ridge called the anorectal ring. The puborectalis muscle maintains the angle between the anal canal and rectum and is an important component in the continence mechanism. The external sphincter forms the bulk of the anal sphincter complex and, although traditionally it has been subdivided into deep, superficial and subcutaneous portions, it is a single muscle, which is variably divided by lateral extensions from the longitudinal muscle layer. The longitudinal muscle is a direct continuation of the smooth muscle of the outer muscle coat of the rectum, augmented in its upper part by striated muscle fibres originating from the medial components of the pelvic floor.
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e-pub ahead of print date: 30 March 2023
Published date: 30 March 2023
Identifiers
Local EPrints ID: 488974
URI: http://eprints.soton.ac.uk/id/eprint/488974
PURE UUID: 9ad5e21c-52a8-49df-828a-98084aae7512
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Date deposited: 10 Apr 2024 16:34
Last modified: 11 Apr 2024 01:51
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Contributors
Editor:
P. Ronan O'Connell
Editor:
Andrew W. McCaskie
Editor:
Robert D. Sayers
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