druas
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A patient with long-standing constipation enters a clinical research
study. After a complete physical examination, a small intraluminal
balloon is inserted through the anus to the rectum. Transducers are
also inserted to measure internal and external anal sphincter pressures.
Inflation of the rectal balloon causes the external anal sphincter to
contract, but the internal anal sphincter, which exhibits normal tone,
fails to relax and the urge to defecate is not sensed. Which of the
following structures is most likely damaged?
A. Internal anal sphincter
B. External anal sphincter
C. Pelvic nerve
D. Pudendal nerve
E. Rectum
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| skyhigh
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d?
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| doc179
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D?
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| druas
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anyone else?
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| Doc2378
Forum Guru
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Pelvic nerve?
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| reet
Forum Fanatic
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C..pelvic nerve.. parasympathetic supply internal sphincter...so is the answer..C
PERISTALSIS AND TONE maintenance by HYPOGASTRIC and symapthetic nerves
 . pudendal supply to external sphincter..(voluntarily contraction)
Edited by reet on 01/25/06 - 10:39 PM
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| robin082006
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agree, I choose a
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| drswapna
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pelvic splanchnic nerve
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| ureterpolyp
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Inflation of the rectal balloon causes the external anal sphincter to
contract
why external anal sphincter contract ? I had thought it should relax
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| reet
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EXTERNAL SPHINCTER has voluntarily control ,,so it can either contract or relax..depends on situation
pudendal nerve has --contraction control on it. if loss no contraction occurs..
Edited by reet on 01/26/06 - 08:33 PM
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