Muscular external sphincter anus

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Lean section through anal canal; B. bladder light; V.D. vas deferens; S.V. seminal vesicle; Rectum; A.C. rectal channel; LA. anarchy; I.S. internal sphinx; E.S. external anal sphincter.

Muscular sphincter or externus muscle (Latin: musculus sphincter or externus muscle) - elliptic shape of the striated muscle of the anus. The location of the external anal sphincter is the center of tendineum perinea. It is located externally from the anterior sphincter of the anus, separated by a longitudinal membrane of the rectal muscles. The activity of the external sphincter is dependent on the will, so it plays a role in the final stages of the defecation process. Being in a state of resting tension, this muscle closes the anus and shrinks more tightly. The aneurysm of the outer anal sphincter originates from the lower anal nerve which is the branch of the vulvar nerve. Bibliography

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