It has been generally accepted that the parasympathetic innervation (secretory and vasodilator) of the parotid gland arises from the inferior salivatory nucleus of the medulla and passes into the glossopharyngeal nerve. At, or just distal to, the jugular foramen, a branch of the nerve conveying preganglionic parasympathetic fibers leaves the ninth nerve and courses back intracranially as the nerve of Jacobson or the tympanic branch of the ninth nerve to the tympanic plexus in the tympanum. From this point these fibers pass as the lesser superficial petrosal nerve to the otic ganglion. Postganglionic fibers run from the otic ganglion by way of the auriculotemporal branch of the mandibular division of the fifth nerve to the parotid gland.1,2
Reichert and Poth3 in 1933, found a marked reduction of secretion from the ipsilateral parotid gland after the ninth nerve was isolated and sectioned intracranially. They reported that this reduction
Davie JC, Bourke RS. Confirmation of Atypical Parasympathetic Innervation of the Parotid GlandAtypical Distribution of Ninth Nerve. Arch Neurol. 1967;16(6):599–605. doi:10.1001/archneur.1967.00470240037004
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