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External Anal Sphincter: Location, Innervation, Function, Diagram The external and internal anal sphincters work together to control the anal canal and support the process of defecation Under normal conditions, the external anal sphincter maintains a state of continuous tonic contraction, keeping the anal canal closed and preventing involuntary stool passage
External anal sphincter: Origin, insertion, action | Kenhub The external anal sphincter is a short tube of skeletal muscle surrounding the inferior portion of the anal canal It is one of the three structures in the anal sphincter complex which controls defecation
External anal sphincter - Wikipedia The proximal portion of external anal sphincter overlaps the internal anal sphincter (which terminates distally a little distance proximal to the anal orifice) superficially; where the two overlap, they are separated by the intervening conjoint longitudinal muscle
External anal sphincter - e-Anatomy - IMAIOS The external anal sphincter (sphincter ani externus) is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the integument surrounding the margin of the anus
External anal sphincter | BioDigital Anatomy The BioDigital Human platform is an interactive 3D, medically accurate, virtual map of the human body—including over 8,000 individually selectable anatomical structures, 850+ simulated 3D health conditions and treatments