Anus external muscle sphincter
External anal sphincter
The smooth muscle fibres of the external longitudinal muscle coat of the rectum terminate by interweaving with striated muscle fibres of the levator ani, or pelvic diaphragm, a broad muscle that forms the floor of the pelvis. A second sphincter, the external anal….
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External anal sphincter EAS is a striated muscle under voluntary control which is supplied by the inferior rectal nerve, a branch of the pudendal nerve. Bharucha c , in Supplements to Clinical Neurophysiology ,
Internal anal sphincter - Wikipedia
The external sphincter is a layer of voluntary striated muscle encircling the outside wall of the anal canal and anal opening.
When a tubular organ or blood vessel becomes excessively narrow such that it can no longer perform as nature intended, it is a condition referred to by physicians as stenosis. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter.
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