Medical Definition of greater petrosal nerve
: a mixed nerve that contains mostly sensory and some parasympathetic fibers, arises in the geniculate ganglion, joins with the deep petrosal nerve at the entrance of the pterygoid canal to form the Vidian nerve, and as part of this nerve sends sensory fibers to the soft palate with some to the eustachian tube and sends parasympathetic fibers forming the motor root of the pterygopalatine ganglion
— called also greater superficial petrosal nerve
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