PHGY 214 Lecture Notes - Lecture 7: Short Circuit, Vagus Nerve, Adenylyl Cyclase
24 Jan 2017
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Document Summary
The neural components of the autonomic nervous system (sympathetic, parasympathetic, enteric) Rest and digest (1)&(2) innervate most organs and controls visceral function, minimal conscious influence. (3) enteric nervous system. In gut, controlled by rest of ans (i. e. how food goes in) Targets: smooth cardiac muscles and glands (heart no control but it has input from the ans) Constant sympathetic and parasympathetic work at most targets. Both pathways have 2 neutrons that synapse in an autonomic ganglion. Control centres -> preganglionic neuron -> autonomic ganglion -> postganglionic neuron -> target tissue. Sympathetic input to adrenal causes epinephrine secretion into the blood. Cns origin of preganglionic - thoracic and lumber spinal cord. Ganglia (postganglionic) - sitting right beside the spinal cord is the chain. In chain close to sc sending out the info. Cns origin of preganglionic - in the brainstem or sacral spinal cord. (down)
