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From Wikipedia, the free encyclopedia
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]
Inferior ganglion of glossopharyngeal nerve | |
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Details | |
From | Glossopharyngeal nerve |
Identifiers | |
Latin | ganglion inferius nervi glossopharyngei, ganglion petrosum |
TA98 | A14.2.01.137 |
TA2 | 6322 |
FMA | 53475 |
Anatomical terms of neuroanatomy |
The pseudounipolar neurons of the inferior ganglion of the glossopharyngeal nerve provide sensory innervation to areas around the tongue and pharynx. More specifically:
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.
The tympanic nerve is the first branch of the glossopharyngeal nerve. It branches at the level of the inferior ganglion. Importantly, the axons which form the tympanic nerve do not synapse in this ganglion or have their cell bodies in it. The neuron cell bodies of the axons which form the tympanic nerve are found in the inferior salivatory nucleus and superior ganglion of the glossopharyngeal nerve.
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