8 Autonomic NS

8 Autonomic NS - AUTONOMIC NERVOUS SYSTEM page 1...

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AUTONOMIC NERVOUS SYSTEM AC Brown page 1 A7a INTRODUCTION A. Divisions of the Peripheral Nervous System 1. Somatic nervous system (voluntary) a. tissues innervated: skeletal muscle b. action: always excitatory (cause muscle contraction) c. CNS (central nervous system) control: voluntary (but has involuntary components; e.g. reflexes) d. no peripheral efferent ganglia or synapses e. effect of denervation: complete loss of function, paralysis; also atrophy 2. Autonomic nervous system (ANS, involuntary) a. tissues innervated: cardiac muscle, smooth muscle (e.g. viscera, blood vessels), glands (most, but not all) b. action: may be excitatory or inhibitory c. CNS control: involuntary in general d. peripheral efferent ganglion and synapse e. effect of denervation: generally continues to function, still subject to local and circulating influences, but loss of CNS coordination f. divisions 1) sympathetic 2) parasympathetic 3. Enteric: innervation contained within the wall of the alimentary tract (sometimes considered as a part of the autonomic system) Note: The following is limited to the Autonomic Nervous System
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AUTONOMIC NERVOUS SYSTEM AC Brown page 2 A7a FUNCTIONAL ANATOMY (motor/efferent fibers) A. Schematic (selected organs)
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AUTONOMIC NERVOUS SYSTEM AC Brown page 3 A7a FUNCTIONAL ANATOMY (motor/efferent fibers) B. Characteristics 1. Common features a. two neurons and a peripheral synapse generally in a ganglion b. first neuron has its cell body in the CNS, is termed preganglionic , and its axon is myelinated c. second neuron has its cell body in the peripheral synapse, is termed postganglionic , is unmyelinated, and innervates the end organ 2. Parasympathetic pathway a. leaves the CNS in certain cranial nerves (III, VII, IX, X) and spinal sacral
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8 Autonomic NS - AUTONOMIC NERVOUS SYSTEM page 1...

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