Autonomic Nervous System Summary

Autonomic Nervous System Summary - BMED 3100: Systems...

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BMED 3100: Systems Physiology 1 Efferent Peripheral Nervous System: The Autonomic Division Somatic: voluntary Autonomic: involuntary Autonomic Nervous System Divisions 1. Sympathetic (1 st described in 2 nd century by Galen, Greek physician): The 4 F’s: fight, flight, fright, fxxx 2. Parasympathetic : rest and digest 3. Enteric: GI control – the “little brain” Together they help maintain homeostasis (fit Cannon’s postulates) Often work as antagonistic control branches Regulated by the brain – control centers: hypothalamus, pons, medulla a. Heart rate b. Blood pressure c. Temperature regulation d. Water balance Cerebral cortex and limbic system can influence response Autonomic reflexes (spinal reflexes) occur without input from brain Synapses b/t neurons are made in the autonomic ganglia All autonomic pathways consist of 2 neurons is series: a. Preganglionic neuron – cell body in CNS, terminals in ganglion Parasympathetic ganglia are located near the effector organs Preganglionic neurons originate in the nuclei of cranial nerves and in SC S2- S4 (cranio-sacral region) Sympathetic ganglia are located in the paravertebral (or sympathetic) chain
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Autonomic Nervous System Summary - BMED 3100: Systems...

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