Lecture 17- Efferent Nervous System Spring 2010

Lecture 17- Efferent Nervous System Spring 2010 - 3 Ds...

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Efferent Division of PNS: Autonomic Motor System and Somatic Motor System (Chapter 11, pages 386-402)
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Descending Somatic Motor Control Pathways
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Somatic Motor Division Control Centers . Idea/incentive for a movement – prefrontal cortex . Planning and coordination – basal nuclei, premotor cortex, cerebellum . Initiation – primary motor cortex (upper motor neurons) . Execution – somatic motor division (lower motor neurons) . Movement – skeletal muscle contraction
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Anatomy of Neuromuscular Junction
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Events at the Neuromuscular Junction
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Sympathetic and Parasympathetic Pathways
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Somatic and Autonomic Pathways - Neurotransmitters
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Sympathetic and Parasympathetic Pathways
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Preganglionic efferent Postganglionic efferent Autonomic ganglion Target organ(s) Mass Action Divergence is an Important Feature of Autonomic Pathways Sensory afferent
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Sympathetic and Parasympathetic Pathways
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Parasympathetic Branch a.k.a. Craniosacral branch Rest and digest branch
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Unformatted text preview: 3 Ds diuresis defecation digestion Energy-generating situations Stimulates insulin watery (motility, secretion) Smooth Muscle Control in Internal Urinary (Urethral) Sphincter Vagus Nerve Sympathetic Branch a.k.a. Thoracolumbar branch Flight or fight branch 4 Es excitement emergency exercise embarrassment Energy-expending situations Inhibits insulin mucous (motility, secretion) Sweating Target Response Depends on Target Receptor (Figure 6-18, p. 194) Phospholipase C Adenylate cyclase Adrenal Medulla Varicosities of Autonomic Neurons Neuroeffector Junction Norepinephrine Release at a Varicosity of a Sympathetic Neuron Autonomic Control Centers in the Brain Hypothalamus main integrating center Pons Medulla In addition: Cerebral cortex Limbic system Autonomic Reflexes e.g. defecation reflex micturition (urination) reflex erection reflex...
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Lecture 17- Efferent Nervous System Spring 2010 - 3 Ds...

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