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Anal sphincter muscles

   Also found in: Wikipedia 0.07 sec.
Anal sphincter muscles
Muscles that control the opening and closing of the anus.
Mentioned in: Endorectal Ultrasound

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(17) The PFM comprise the pelvic diaphragm muscles (pubococcygeus, puborectalis, and iliococcygeus, together known as the levator ani), which can be referred to as the deep layer of the PFM; the urogenital diaphragm muscles (ischiocavernosus, bulbospongiosus, and transversus perinei superficialis, together known as the perineal muscles), which can be referred to as the superficial layer of the PFM; and the urethral and anal sphincter muscles (Figs.
 
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