True about tympanic nerve:
The Tympanic nerve, or Jacobson nerve, is a branch of the Glossopharyngeal nerve. It contains preganglionic parasympathetic fibers, and forms a tympanic plexus on the medial wall of the middle ear with sympathetic fibers. The Tympanic nerve continues beyond the plexus as the Lesser petrosal nerve, which transmits preganglionic parasympathetic fibers to the otic ganglion for synapse.
Is a branch of the facial nerve
Contains postganglionic parasympathetic fibers
Synapses with fibers in the lesser petrosal nerve
Is a branch of the glossopharyngeal nerve
Cranial Nerves