Ans
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ANSANS
Prof. Vajira WeerasingheProf. Vajira Weerasinghe
Dept of PhysiologyDept of Physiology
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Sympathetic vs Sympathetic vs parasympathetic parasympathetic
►Distribution on different organsDistribution on different organs►Actions on different organsActions on different organs►Drugs acting on receptors Drugs acting on receptors ►Reflexes in different systems Reflexes in different systems
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Sympathetic vs Sympathetic vs parasympathetic parasympathetic
►Distribution on different organsDistribution on different organs
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Fig. 9.6Fig. 9.6
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Sympathetic (Thoracolumbar) Sympathetic (Thoracolumbar) DivisionDivision
► Preganglionic cell bodies in lateral Preganglionic cell bodies in lateral horns of spinal cord T1-L2: horns of spinal cord T1-L2: thoracolumbarthoracolumbar
► Preganglionic axons pass through Preganglionic axons pass through ventral roots to ventral roots to whitewhite rami rami communicantescommunicantes to the to the retroperitoneal retroperitoneal sympathetic chain sympathetic chain gangliaganglia
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Parasympathetic Parasympathetic (Craniosacral) Division(Craniosacral) Division
► Preganglionic cell bodies in Preganglionic cell bodies in nuclei of brainstem or nuclei of brainstem or lateral parts of spinal cord lateral parts of spinal cord gray matter from S2-S4gray matter from S2-S4 Preganglionic axons Preganglionic axons
from brain pass to from brain pass to terminal ganglia through terminal ganglia through cranial nerves III, VII, IX cranial nerves III, VII, IX and Xand X
Preganglionic axons Preganglionic axons from sacral region pass from sacral region pass through through pelvic nervespelvic nerves to terminal gangliato terminal ganglia
► Terminal gangliaTerminal ganglia located located near organ innervated or near organ innervated or embedded in wall of organembedded in wall of organ
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Sympathetic vs Sympathetic vs parasympathetic parasympathetic
►Actions on different organsActions on different organs
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Sympathetic vs Sympathetic vs parasympathetic parasympathetic
►Drugs acting on receptors Drugs acting on receptors
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Parasympathetic
Sympathetic
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salbutamol
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Sympathetic vs Sympathetic vs parasympathetic parasympathetic
►Reflexes in different systems Reflexes in different systems
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ANS reflexesANS reflexes
► CVS: CVS: baroreceptor reflexbaroreceptor reflex Control of heart rateControl of heart rate chemoreceptor reflexchemoreceptor reflex
► GIT: GIT: GIT secretions and motility GIT secretions and motility
► Other:Other: Urinary bladder controlUrinary bladder control Sexual reflexesSexual reflexes SweatingSweating Other visceral reflexes Other visceral reflexes