[1] 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.

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.