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GI Q

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cool_guyp4u
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04/14/06 - 08:29 AM

This Q is from Kaplan Physio lecture notes.

Functions that do not need extrinsic innervation include:

a, Initiation of swallowing

b, stomach emptying

c, defeacation

d, Mixing and propulsion of small intestine

doc179
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04/14/06 - 08:39 AM

2 answers? B and D

cool_guyp4u
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04/14/06 - 09:26 AM

doc179,

You are correct. I am sure about D, but stomach emptying requires Ach secretion from the Parasym. Does this mean that Sym and Parasym are not counted in extrinisic inervation?

doc179
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04/14/06 - 09:53 AM

extrinsic is the one which is under our control . ANS is not under our control

cool_guyp4u
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04/14/06 - 02:56 PM

doc179 wrote:
extrinsic is the one which is under our control . ANS is not under our control

Thanq thanq

star1
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04/14/06 - 04:51 PM

Extrinsic mean that Organ need external control . I dont think so that its autonomic control. Suppose we cut the Autonomic nerve supply to the heart ... what will happened to heart?? It will beat at its own pace maker rate.

I will go for D as when food enter the intestine I will cause distension and will lead to the secretion of local GIT hormone and also local autonomic stimulation ie myenteric plexus.

Now confusing part which causes stomach emptying ? cant think about it right now if someone know factor helping in the stomach emptying plz clerify... thanks

krsna
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04/16/06 - 02:01 PM

u said it urself star1...dilation causes secretion of local hormones and hence motility.

the prob here is stomach also has vagal innervation....so it is innervated externally...

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