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Jackofknives
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10/19/07 - 01:32 AM

Damage to the pelvic nerves does which of the following?

(A) has little, if any, effect on the defecation reflex
(B) Attenuates the defecation reflex
(C) Increases the strength of the defecation reflex
(D) Results in a continuous urge to defecate (rectal urgency)

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mikky
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10/19/07 - 02:28 AM

a... failure 2 raise intraabdominal pressure...

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Jackofknives
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10/20/07 - 03:24 AM

try again

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sureshrx
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10/20/07 - 11:19 AM

b) attenuates the defaecation reflex.
pelvic nerves have nothing to do with raising intra abd pressure

mikky
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10/20/07 - 11:33 AM

b.... i was thinking of phrenic nerve... rolling eyes

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SmokyWaters
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10/20/07 - 11:44 AM

SmokyWaters
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10/20/07 - 11:45 AM

efferents to defectation reflex from s2-4

sfk
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10/20/07 - 12:16 PM

B

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Jackofknives
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10/22/07 - 02:35 AM

for effective defecation to occur, the local myentertic reflex that stimulates the contraction must be reinforced by parasympathetic signals that travel to the descending colon, sigmoid, rectum, and anus by the pelvic nerves. These parasympathetic signals intensify the peristaltic waves as well as relax the internal anal sphincter and thus convert the weak myenteric reflex to a powerful process of defecation.

Concept tested: slow wave per se is not sufficient for intestinal propulsion.

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mxstud
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05/20/08 - 03:35 PM

#10

mikky wrote:
b.... i was thinking of phrenic nerve... rolling eyes

phrenic nerve confused

??¡¡??

Ig F
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06/03/08 - 06:49 AM

#11

Jackofknives wrote:
for effective defecation to occur, the local myentertic reflex that stimulates the contraction must be reinforced by parasympathetic signals that travel to the descending colon, sigmoid, rectum, and anus by the pelvic nerves. These parasympathetic signals intensify the peristaltic waves as well as relax the internal anal sphincter and thus convert the weak myenteric reflex to a powerful process of defecation.

Concept tested: slow wave per se is not sufficient for intestinal propulsion.

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