Podcast
Questions and Answers
What type of muscle is the external anal sphincter?
What type of muscle is the external anal sphincter?
- Voluntary (correct)
- Cardiac
- Involuntary
- Smooth
To what does the external anal sphincter attach anteriorly?
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?
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?
Where is the pecten situated in relation to the anal canal?
What controls the contraction and tonus of the internal anal sphincter?
What controls the contraction and tonus of the internal anal sphincter?
Which part of the external anal sphincter is often indistinct due to zones rather than muscle bellies?
Which part of the external anal sphincter is often indistinct due to zones rather than muscle bellies?
What causes temporary relaxation of the internal anal sphincter?
What causes temporary relaxation of the internal anal sphincter?
How is the internal anal sphincter inhibited?
How is the internal anal sphincter inhibited?
What relaxes temporarily in response to distension of the rectal ampulla by feces or gas?
What relaxes temporarily in response to distension of the rectal ampulla by feces or gas?
Which nerve supplies the superior 2/3 of the anal canal?
Which nerve supplies the superior 2/3 of the anal canal?
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