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The external musculature of the anal canal is formed by the external sphincter muscle of the anus (EAS), arranged in the shape of sleeve so as to surround 2–3 cm the terminal portion of the rectum and the anal canal. The EAS is composed by three parts: a subcutaneous, a superficial, and a deep part. The subcutaneous part about 3–5 mm in diameter surrounds the anal orifice directly above the edge of the anus, below, and slightly to the side to the internal sphincter muscle of the anus; in women, this part of the external sphincter muscle of the anus is more developed, especially anteriorly, where it forms a prominent annular bandage, which is sometimes engraved in the course of an episiotomy.
The deep part of the external anal sphincter muscle is for the most part an annular muscle bundle, not joined to the coccyx; posteriorly it is intimately fused with the pubo-rectal muscle since the fibers of this muscle, with a course in sling, pass around the terminal part of the rectum. Prior to the rectum, muscular fibers intersect with those of the opposite side mingling in part with the fibers of the superficial transverse perineal muscles; also in back fibers are mixed to fit in the anococcygeal raphe.
