External anal sphincter
Flat plane of skeletal muscle fibers / From Wikipedia, the free encyclopedia
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The external anal sphincter (or sphincter ani externus) is an oval tube of skeletal muscle fibers.[1] Distally, it is adherent to the skin surrounding the margin of the anus.[2] It exhibits a resting state of tonical contraction.[1]
Quick Facts Details, Nerve ...
External anal sphincter | |
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Details | |
Nerve | Branch from the fourth sacral and contributions from the inferior hemorrhoidal branch of the pudendal nerve |
Actions | Keep the anal canal and orifice closed |
Identifiers | |
Latin | sphincter ani externus |
TA98 | A04.5.04.012 |
TA2 | 2426 |
FMA | 21930 |
Anatomical terms of muscle |
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