BIOL-2220 Lecture Notes - Lecture 4: Sarcolemma, Vagus Nerve, Reflex Arc
23 Jan 2018
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Identify the functions of the autonomic nervous system. Ans: system of motor neurons that involuntarily innervates smooth muscle, cardiac muscle, and glands (involuntary) Differentiate autonomic motor units from peripheral motor units. Differ in effectors, efferent pathways, & target organ responses to their neurotransmitters. Conduction of autonomic efferent system is slower than the somatic motor system. Neurotransmitter effects: ach: released by all somatic motor neurons at their synapses w skeletal muscle fibers, autonomic postganglionic fibers, ne: secreted by most sympathetic fibers, ach: secreted by parasympathetic fivers. Both ans systems are rarely all-or-none fashion: constantly changing: some service the same effector organs: both go to pupil of eye (constrict/dilate) Identify the site of origin of preganglionic neurons and location of ganglionic neuron cell bodies for all sympathetic and parasympathetic pathways. Visceral reflex components: receptor, visceral sensory neuron, travel w cranial nerves, splanchnic nerves, and sympathetic trunks, send info concerning chem changes, stretch, and irritation of the viscera, first link in autonomic reflexes.
