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Compare between sympathetic and parasympathetic in reflex arc?

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November 14, 2015 2:01AM

In parasympathetic reflex arc the preganglionic nerve fibre is

longer than post ganglionic fibre, that is the synapse occur near

the organ or tissue. While in sympathetic reflex arc both the pre

and post have moderate sizes. The postganglionic fibre of

parasympathetic always secrete acetylcholine as

nuerotransmitter while postganglionic fibre of sympatheic reflex

arc mostly secrete norepinephrine or epinephrine as

nuerotransmitter. Some nerve fibres may secrete acetylcholine. For

example postganglionic sympatehtic nerve fibres of sweat glands,

pilorectal muscles and few blood vessels


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