The ganglion associated with the glossopharyngeal nerve (CN IX) for parasympathetic innervation to the parotid gland is the:

The otic ganglion is the parasympathetic ganglion associated with the glossopharyngeal nerve (CN IX). The pathway is: CN IX → lesser petrosal nerve → otic ganglion (synapse) → auriculotemporal nerve (branch of CN V3) → parotid gland. The pterygopalatine ganglion is associated with the facial nerve (CN VII) and supplies the lacrimal gland and nasal/palatal glands. The trigeminal ganglion is a sensory ganglion. The geniculate ganglion is the sensory ganglion of the facial nerve.