Lecture title - SNS/PSNS - Sympathetic influences

4 important questions on Lecture title - SNS/PSNS - Sympathetic influences

What is the function of the sympathetic influences?

Inhibition of secretions, contraction of sphincters, blood vessel constriction and gut motility inhibition

What is the neurotransmitter involved in the sympathetic influences?

Norepinephrine

What is the mechanism of the sympathetic signals?

Splanchnic nerves carry preganglionic fibers from mechanoreceptors and chemoreceptors and synapse to prevertebral ganglia such as the celiac (stomach) and mesenteric (intestinal) ganglia
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What is the purpose of the sympathetic influences to the gut?

They signal presence of pathological conditions such as painful stimulus, which inhibits gut motility/secretions

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