The otic ganglion (AB1) is a flat body lying below the oval foramen on the medial side of the mandibular nerve (A2), from where sensory and motor fibers (sensorimotorroots) (AB3) enter the ganglion and passthrough without synapsing. The pregan-glionic parasympathetic fibers originate from the inferior salivatory nucleus. They run in the glossopharyngeal nerve and branch off, together with the tympanic nerve, from the inferior ganglion of the glos-sopharyngeal nerve in the petrous fossula to the tympanic cavity. The fibers leave the tympanic cavity through the hiatus for the lesser petrosal nerve as a fine branch, the lesser petrosal nerve (AB4) (parasympatheticroot). The nerve runs beneath the duramater along the surface of the petrous bone and reaches the otic ganglion after passing through the foramen lacerum. The fibers of the sympathetic root (AB5) originate from the plexus of the middle meningeal artery.
The motor fibers from the motor root of the trigeminal nerve pass through the ganglion and leave it in the nerve to tensor veli palatine (B6) (soft palate) and in the nerve to tensortympani (B7) (for the muscle that tightensthe tympanic membrane). Motor fibers (B8) for the levator veli palatini from the facial nerve (VII) are thought to run in the chorda tympani (AB9) and cross over into the gan-glion via the communicating branch withchorda tympani (AB10). They pass throughwithout synapsing and enter via a com-municating branch (A11) the greaterpetrosal nerve (A12), in which they reachthe pterygopalatine ganglion (A13). They pass to the palate in the palatine nerves (A14).
The postganglionic secretory (parasympa-thetic) fibers together with sympathetic fibers enter the auriculotemporal nerve (AB15) via a communicating branch and from here into the facial nerve (AB16) via another anastomosis. The fibers then ramify in the parotid gland (AB17) together with branches of the facial nerve. Apart from the parotid gland, they supply the buccal and labial glands via the buccal nerve and the in-ferior alveolar nerve.