PHGY 209 Lecture Notes - Autonomic Nervous System, Vagus Nerve, Cardiac Output

• School: McGill University
• Department: Physiology
• Course: PHGY 209
• Professor: David Ragsdale

Document Summary

Ans=sensory +motor system regulates visceral tissues and organs, internal environment (homeostasis) Sympathetic (fight or flight) + parasympathetic (rest and digest) . Sc cell groups called autonomic ganglia (ganglia= cell bodies+ Activated by preganglionic neurons (cell bodies in the sc or brainstem) Sympathetic: stimulation hr and the strengths of contraction. Sensory info (from visceral organs) brain by vagus nerve (head and neck) brain by glossopharyngeal and facial nerves. ==inputs synapse in brainstem nuclei direct autonomic reflexes and project to higher brain areas (hypothlamus and cerebral cortex) regulates more complex autonomic responses. Baroreceptor reflex sympathetic activation in cardiac output + in bp activate pressure sensitive barareceptor neurons parasympathetic activation bp and hr. Enteric nervous system (controls gi tract, pancreas and the gall bladder) 100m neurons=sc. Controls sm in gut + blood vessels an secretion by mucosa. Input from sympathetic and parasympathetic, but it can function on its own. Cholinergic neurons activate peristaltic contractions of the gut.