The inferior ganglion of the glossopharyngeal nerve (petrosal ganglion) is a sensory ganglion. It is larger than and inferior to the superior ganglion of the glossopharyngeal nerve. It is located within the jugular foramen.[1]
The pseudounipolar neurons of the inferior ganglion of the glossopharyngeal nerve provide sensory innervation to areas around the tongue and pharynx. More specifically:
innervation of taste buds on the posterior 1/3 of tongue
general sensory innervation of posterior 1/3 of tongue, soft palate, palatine tonsils, upper pharynx and Eustachian tubes
innervation of baroreceptor cells in the carotid sinus
innervation of glomus type I chemoreceptor cells in the carotid body
The central processes of the neurons which provide taste sensation synapse in the rostral portion of the solitary nucleus (also called the gustatory nucleus). The central processes of the neurons which provide general sensory information synapse in the spinal trigeminal nucleus. Finally, the central processes of the neurons which innervate the carotid sinus and carotid body synapse in the caudal portion of the solitary nucleus.
^Rubin, Michael (2017). Netter's Concise Neuroanatomy. Safdieh, Joseph E., Netter, Frank H. (Frank Henry), 1906-1991 (Updated ed.). Philadelphia, PA: Elsevier. pp. 253–256. ISBN 9780323480918. OCLC 946698976.
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