U of M HLTH 2030 - The Autonomic Nervous System (86 pages)

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The Autonomic Nervous System



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The Autonomic Nervous System

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Lecture Notes


Pages:
86
School:
University of Minnesota- Twin Cities
Course:
Hlth 2030 - Applied Human Anatomy

Unformatted text preview:

The Autonomic Nervous System Chapter 15 Introduction The Autonomic Nervous System ANS is the system of motor neurons that innervate the smooth muscle cardiac muscle and glands of the body By controlling these effectors the ANS regulates such visceral functions as Heart rate Blood pressure Digestion Urination Introduction The ANS is the general visceral motor division of the peripheral nervous system and is distinct from the general somatic motor and brachial motor divisions which innervate skeletal muscles Introduction The general visceral sensory system continuously monitors the activities of the visceral organs so that the autonomic motor neurons can make adjustments as necessary to ensure optimal performance of the visceral organs Introduction The stability of our internal environment depends largely on the autonomic nervous system Autonomic nervous system ANS receives signals from visceral organs The ANS makes adjustments as necessary to ensure optical support for body systems Comparison of ANS PNS Recall that the somatic motor system innervates skeletal muscles Each somatic motor neuron runs from the central nervous system all the way to the muscle being innervated and that each motor unit consists of a single neuron plus the skeletal muscle cells it innervates Typical somatic motor axons are thick heavily myelinated fibers that conduct nerve impulses rapidly Comparison of ANS PNS Comparison of ANS PNS In the somatic system Cell bodies are within the central nervous system Axons extend to the muscles they serve Somatic motor fibers are thick heavily myelinated Type A fibers that conduct impulses very rapidly Comparison of ANS PNS In the autonomic nervous system The motor unit is a two neuron chain The cell body of the first neuron the preganglionic neuron resides in the brain or spinal cord Its axon the preganglionic axon synapses with the second motor neuron the postganglionic neuron in an autonomic ganglion outside the central nervous system The



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