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Lecture

atonomic nervous system

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School
Department
Biology
Course
BIOL 2020U
Professor
Ani
Semester
Fall

Description
Outline of Lecture 39 (05-21 C; Schramm) Autonomic Nervous System Somatic vs. Autonomic Nervous System - Somatic neurons project directly to skeletal muscles and nothing else; motoneurons (cell bodies in spinal cord) terminate at motor end plates and release ACh onto skeletal muscles, causing contraction - Autonomic neurons also lie in the spinal cord but do not project directly to targets; instead, the preganglionic neurons project to postganglionic neurons in ganglia, which project directly to targets Sympathetic Nervous System - For CV: ↑HR, ↑contractility, contracts VSM, ↑vascular resistance - Preganglionic neurons found in T1-L3 and project to three places 1) Paravertebral ganglia (sympathetic chain) 2) Prevertebral ganglia (reached via long splanchnic nerves) 3) Adrenal gland chromafin cells (via splanchnic nerve) - Preganglionic neurons release
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