ch17ppt - 17-1Chapter 17 The Autonomic Nervous...

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Unformatted text preview: 17-1Chapter 17 The Autonomic Nervous SystemRegulate activity of smooth muscle, cardiac muscle & certain glandsStructures involvedgeneral visceral afferent neuronsgeneral visceral efferent neuronsintegration center within the brainReceives input from limbic system and other regions of the cerebrum17-2Autonomic versus Somatic NSSomatic nervous systemconsciously perceived sensationsexcitation of skeletal muscleone neuron connects CNS to organAutonomic nervous systemunconsciously perceived visceral sensations involuntary inhibition or excitation of smooth muscle, cardiac muscle or glandular secretiontwo neurons needed to connect CNS to organpreganglionic and postganglionic neurons17-3Autonomic versus Somatic NSNotice that the ANS pathway is a 2 neuron pathway while the Somatic NS only contains one neuron.17-4Basic Anatomy of ANSPreganglionic neuroncell body in brain or spinal cord axon is myelinated type B fiber that extends to autonomic ganglionPostganglionic neuroncell body lies outside the CNS in an autonomic ganglionaxon is unmyelinated type C fiber that terminates in a visceral effector17-5Divisions of the ANS2 major divisionsparasympatheticsympatheticDual innervationone speeds up organone slows down organSympathetic NS increases heart rateParasympathetic NS decreases heart rate17-6Sources of Dual InnervationSympathetic (thoracolumbar) divisionpreganglionic cell bodies in thoracic and first 2 lumbar segments of spinal cordParasympathetic (craniosacral) divisionpreganglionic cell bodies in nuclei of 4 cranial nerves and the sacral spinal cord17-7Locations of Autonomic GangliaSympathetic Gangliatrunk (chain) ganglia near vertebral bodiesprevertebral ganglia near large blood vessel in gutceliac superior mesentericinferior mesentericParasympathetic Gangliaterminal ganglia in wall of organ17-8Autonomic PlexusesCardiac plexusPulmonary plexusCeliac (solar) plexusSuperior mesentericInferior mesentericHypogastric17-9Structures of Sympathetic NSPreganglionic cell bodies at...
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ch17ppt - 17-1Chapter 17 The Autonomic Nervous...

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