The otic ganglion lies under the foramen ovale, where the interior division of the fifth comes from the cranium. Its roots are - (1) motor; (2) sensory, from the inferior division of the fifth; and (3) sympathetic, made up of a couple of fine filaments from the plexus, around the meningeal artery. By its branches it communicates with the seventh, chorda tympani, and sends filaments to the parotid gland.