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CN IX: Glossopharyngeal nerve, GAG reflex, Visceral sensations of carotid…
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GAG reflex
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Protective reflex that prevents the entry of foreign objects into the alimentary and respiratory passage
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Swallowing sequence is initiated, probably by signals from the cerebral cortex to swallowing center(s) in the brainstem, simultaneous inhibitory signals are sent to the gag center in the brainstem to turn off the gag reflex
- Visceral sensations of carotid body and sinus ascend in carotid nerve (close to carotid artery) to reach inferior glossopharyngeal ganglion
- Ganglionic neurons enter the medulla descend in the tractus solitarius to synapse with nucleus solitarius neurons
- Connections are made with reticular formation and hypothalamus for appropriate reflex response for the control of:
- Repiration, BP, cardiac output
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