Anatomy of Ileocecal Valve and Ascending Colon
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Questions and Answers

What type of muscle is the external anal sphincter?

  • Voluntary (correct)
  • Cardiac
  • Involuntary
  • Smooth

    • To what does the external anal sphincter attach anteriorly?

  • Coccyx
  • Puborectalis Muscle
  • Perineal Body (correct)
  • Anococcygeal Ligament

    • Which nerve mainly supplies the external anal sphincter?

  • Third Lumbar Nerve (L3)
  • Fourth Sacral Nerve (S4) (correct)
  • First Sacral Nerve (S1)
  • Fifth Lumbar Nerve (L5)

    • Where is the pecten situated in relation to the anal canal?

    <p>Between the Hilton’s line and the pectinate line (C)</p> Signup and view all the answers

    What controls the contraction and tonus of the internal anal sphincter?

    <p>Parasympathetic fibers from the Superior Rectal Plexus (C)</p> Signup and view all the answers

    Which part of the external anal sphincter is often indistinct due to zones rather than muscle bellies?

    <p>Deep External Anal Sphincter (B)</p> Signup and view all the answers

    What causes temporary relaxation of the internal anal sphincter?

    <p>Rectal distension by feces or gas (D)</p> Signup and view all the answers

    How is the internal anal sphincter inhibited?

    <p>By parasympathetic fiber stimulation (C)</p> Signup and view all the answers

    What relaxes temporarily in response to distension of the rectal ampulla by feces or gas?

    <p>Internal Anal Sphincter (B)</p> Signup and view all the answers

    Which nerve supplies the superior 2/3 of the anal canal?

    <p>Superior Rectal Nerve (D)</p> Signup and view all the answers

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