ACB 334 Lecture Notes - Lecture 22: Motor Neuron, Autonomic Nervous System, Parasympathetic Nervous System

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Ans = controls smooth muscle, cardiac muscle and secretory tissues (glands) mostly thought to be an involuntary motor system. Involves a chain of at least two neurons preganglionic and postganglionic neurons. Broken up into sympathetic, parasympathetic, and enteric (gi system) ns. Where present, the 3rd neuron (enteric) is part of a plexus found within the intestinal wall: e. g. meiss(cid:374)er"s ple(cid:454)us, auer(cid:271)a(cid:272)h"s ple(cid:454)us. Under the control of cns to maintain homeostasis. Concerned w/ anabolic properties, stressful/dangerous situations regeneration after dangerous situations. *the 2 divisions often (not always) innervate the same targets and have opposite effects on function. Posterior horns = visceral and somatic sensory neurons. Sympathetic ns = is both cholinergic (ach) and noradrenergic (na) (but sweat glands = both. Ach: preganglion = ach, postganglion = na. Preganglionic neuron (1st neuron) synapses on post-ganglionic neurons (2nd neurons) terminal varicosities. Acts in divergent manner to invoke general mass reaction throughout the body (due to.

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