The anatomy of the anus

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Visceral innervation via the inferior hypogastric plexus. Bulb of the penis Perineal body. For a guide on performing a digital rectal examination, visit our sister site TeachMeSurgery. Top of page Table of Contents. Parasympathetic fibers supply the smooth muscle, including the internal sphincter. By using this site, you agree to the Terms of Use and Privacy Policy. The lower half of the anal canal, below the pectinate lineis divided into two zones separated by Hilton's white line.

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Sacrum and coccyx Piriformis Coccygeus Levator ani Sacral plexus.

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Chapter 36: The rectum and anal canal

Perineal body Urogenital diaphragm Urethra Bulb of the penis. Which structure does not form part of the anorectal ring? Sympathetic nervous supply to the rectum is from the lumbar splanchnic nerves and superior and inferior hypogastric plexuses. Anal canal Image of the anus affected by hemorrhoids. The two parts are the zona hemorrhagica and zona cutanea, lined by stratified squamous non-keratinized and stratified squamous keratinized epithelium, respectively.

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