autonomic nervous system dr. sama-ul-haque. objectives define autonomic nervous system. describe...
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Autonomic Nervous System
Dr. Sama-ul-Haque
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Objectives
• Define autonomic nervous system.
• Describe sympathetic and parasympathetic nervous system.
• Enumerate the functions of sympathetic and parasympathetic nervous system.
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• ANS is the subdivision of the peripheral nervous system that regulates body activities that are generally not under conscious control
• Visceral motor innervates non-skeletal (non-somatic) muscles
• Composed of a special group of neurons serving: – Cardiac muscle (the heart)– Smooth muscle (walls of viscera and blood vessels)– Internal organs– Skin
The Autonomic Nervous System
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Basic anatomical difference between the motor pathways of the voluntary somatic nervous system (to skeletal muscles) and those of the autonomic nervous system
• Somatic division:– Cell bodies of motor neurons reside in CNS (brain or spinal
cord)– Their axons (as nerves) extend all the way to their skeletal
muscles.
• Autonomic system: chains of two motor neurons– 1st = preganglionic neuron (in brain or cord)– 2nd = gangionic neuron (cell body in ganglion outside CNS)
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• Axon of 1st (preganglionic) neuron leaves CNS to synapse with the 2nd (ganglionic) neuron.
• Axon of 2nd (ganglionic) neuron extends to the organ it serves
Diagram contrasts somatic (lower) and autonomic:
autonomic
somatic
this dorsal root ganglion is sensory
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Divisions of the autonomic nervous system
• Parasympathetic division• Sympathetic division
Serve most of the same organs but cause opposing or antagonistic effects
Parasympathetic: routine maintenance“rest &digest”
Sympathetic: mobilization & increased metabolism “fight, flight or fright”
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Where they come from
ParasympatheticCraniosacral
SympatheticThoracolumbar
T1 to L2
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Paravertebral Ganglionic chain or
Sympathetic Trunk
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Paravertebral Ganglionic
chain
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Spinal Nerve
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Sympathetic nerve
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Sympathetic Nervous system
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Parasympathetic Nervous system
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Functions of Sympathetic Nervous System
• Increased Heart Rate• Increased Blood Pressure• Pupil Dilation• Decreased Urination• Increased Sweating• Bronchial Dilation• Decreased Salivation
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Functions of Parasympathetic Nervous System
• Decreased Heart Rate• Decreased Blood Pressure• Pupil Constriction• Increased Urination• Decreased Sweating• Bronchial Constriction• Increased Salivation