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Which nerves contain the most parasympathetic preganglionic fibers a trigeminal b splanchnic c optic d vagus?
Wiki User
∙ 13y ago
D. vagus. this is the largest Cranial nerve, carrying parasympathetic information to much of the body (ie. esophagus, GI tract, heart). parasympathetic fibers, unlike sympathetic fibers, do not synapse until they are pretty much on in or near the organ. So the vagus is made up of preganglionic parasympathetics.
trigeminal contains somatic afferents, and somatic efferents. neither of these are visceral efferents (which could be para or sympathetic).
wikipedia tells you correctly that splanchnic nerves are generally sympathetic autonomics, except for one spot.
optic nerve is carrying Afferent sensory information Away from the eye.
Wiki User
∙ 13y ago
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