Ch 17: Autonomic Division of NS Overview of ANS Sympathetic Division Para Sympathetic Division
Brewer, Kim, On-Air Personality has reference to this Academic Journal, PHwiki organized this Journal Ch 17: Autonomic Division of NS Compare in addition to contrast the structures of the sympathetic in addition to the parasympathetic divisions, including functions in addition to neurotransmitters. Show the levels of integration in the ANS, in addition to compare these with the SNS. Overview of ANS Pathway as long as Visceral Motor Output ANS has two antagonistic divisions: Sympathetic Parasympathetic ANS output always involves two neurons between spinal cord (CNS) in addition to effector. Synapsing takes place in ganglia Naming of neurons: Fig 17.3
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Sympathetic Division Thoracolumbar division Preganglionic neurons (cell bodies) located between T1 & L2 of spinal cord Ganglionic neurons (cell bodies) in ganglia near vertebral column Paravertebral ganglia = sympathetic chain ganglia Prevertebral ganglia = collateral ganglia Special case: adrenal medulla Effects of Sympathetic Division Special Case: Adrenal medulla Modified sympathetic ganglion Terminus as long as neuron 1, stimulates specialized 2nd order neurons with very short axons in adrenal medulla to release NT into blood stream (= hormones) Epinephrine (adrenalin) ~ 80% in addition to norepinephrine (noradrenalin) Endocrine effects are longer lasting than nervous system effects Fig. 17-6 Sympathetic Neuroeffector Junctions Fig 17-6 Differ from somatic neuromuscular junctions Varicosities
Summary of Sympathetic Division A. Neuron 1 is short, neuron 2 is long B. Synapsing occurs in prevertebral chain ganglia or paravertebral collateral ganglia C. Neuron 1 releases Ach, usually neuron 2 releases NE D. Prepares as long as emergency action, excitatory to many organs, inhibitory to others ( digestive as long as example) E. Effects very widespread in addition to somewhat persistent Para Sympathetic Division Craniosacral division Preganglionic neurons (cell bodies) located in brain stem & sacral segments of spinal cord Ganglionic neurons (cell bodies) in ganglia near target organs: Intramural ganglia Effects of parasympathetic division Summary of Parasympathetic Division A. Neurons 1 are long, come from the brain stem or sacral spinal cord, run with the spinal or pelvic nerves in addition to produce ACh. B. Neurons 2 are short, produce ACh, in addition to may be either excitory or inhibitory.
Anatomy of Dual Innervation Each organ receives innervation from sympathetic in addition to parasympathetic fibers Fibers of both divisions meet & commingle at plexuses (fig 17-9) to innervate organs close to those centers Names of plexuses derived from locations or organs involved
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