ACTIVITY in ANS.docx - Autonomic Nervous System 1....

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Autonomic Nervous System1. Preganglionic fiber- fibers from the CNS that supply the ganglion, whether they are in the sympatheticdivision or in the parasympathetic division are CHOLINERGIC in nature that is these fibers usesacetylcholine as their neurotransmitter and are myelinated for faster transmission. It tends to be shorterparasympathetic fibers and sympathetic fibers tends to form more synapses than parasympathetic fibers.2. Ganglion- a cluster of interconnecting nerve cells outside the brain that submit sensory signals fromthe periphery to the integration centers in CNS. They are essentially a junction between autonomicnerves originating from the CNS and autonomic nerves innervating their target organs in the periphery.3. Postganglionic fiber-in the ANS, these are the fibers from the ganglion to the effector organ. They areADRENERGIC and uses Norepinephrine (also called Noradrenalin) as a neurotransmitter. By contrast,postganglionic fibers in the parasympathetic division are CHOLINERGIC and use Acetylcholine as aneurotransmitter.

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