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Author Topic: Whats the nerve called that tells the brain im hungry??  (Read 6880 times)

Offline stana

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Offline SquarishTriangle

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Whats the nerve called that tells the brain im hungry??
« Reply #1 on: 17/11/2007 02:35:54 »
Well to start you off, there are a few things (stimuli) that can trigger hunger:

1. an empty stomach: detected by stretch receptors (mechanoreceptors) in the stomach wall (?) → afferent (sensory) fibres of cranial nerve X (vagus nerve) → brain stem
2. gastric hypermotility (such as caused by moderate exercise)
3. taste: sensed by taste buds → cranial nerves V (trigeminal), VII (facial) and IX (glossopharyngeal) → brain stem
4. smell (of food): sense by olfactory cells in the nose → cranial nerve I (olfactory) → brain stem.
5. sight: cranial nerve II (optic) → brain stem

The brain is responsible for integrating all this incoming sensory information and interpretating it as hunger, and hence a need to eat.
 

Offline chris

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Whats the nerve called that tells the brain im hungry??
« Reply #2 on: 22/11/2007 18:44:17 »

3. taste: sensed by taste buds → cranial nerves V (trigeminal), VII (facial) and IX (glossopharyngeal) → brain stem

Doesn't the taste from the anterior two thirds of the tongue, carried in the chorda tympani, run with the fibres of the trigeminal (V) but without actually being part of that cranial nerve?

Chris
 

Offline SquarishTriangle

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Whats the nerve called that tells the brain im hungry??
« Reply #3 on: 23/11/2007 02:23:11 »
Ahh, yes. Thanks for clearing that up Chris.

Do you think you could sort us out on the gall bladder issue over in Med if you have time? Ta.
 

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Whats the nerve called that tells the brain im hungry??
« Reply #3 on: 23/11/2007 02:23:11 »

 

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