Otic Ganglia

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1. Otic ganGlia Rana Usama Amjad MBBS-II Rai Medical College Sargodha

2. OTIC GANGLIA . Parasympathetic Ganglia . Topographically: Mandibular Nerve . Functionally: Glossopharyngeal Nerve

3. Structure: . 2-3mm . Oval shaped . Reddish-grey colour

4. Location & relations: =>Below FORAMEN OVALE in infratemporal fossa =>Laterally: Trunk of MANDIBULAR NERVE =>Medially: Cartilaginous part of AUDITORY TUBE =>Posteriorly: Middle MENINGEAL Artery

5. Connections: 3 types of connections… . Parasympathetic . Sympathetic . Sensory & Motor

6. Parasympathetic: => Pre-ganglionic parasympathetic fiber originate from INFERIOR SALIVATORY NUCLEUS => Fibers leave Glossophrangyeal nerve by tympanic branch & leave the otic ganglia by Tympanic plexus & Lesser petrosal nerve => Here fiber synapse & post-ganglionic fibers pass by communicating branches of Auriculotemporal nerve and supply Parotid gland. e => Produce Vasodilator & Secretomotor effect.

7. Sympathetic: => Post-ganglionic arising in Superior Cervical Ganglia. => Sympathetic root derived from plexus around Middle Meningeal Artery. => Fibers cannot relay in otic ganglia and reach Parotid gland via Auriculotemporal nerve. => Fibers are Vasomotor in function.

8. Sensory & motor: => Sensory root comes from Auriculotemporal nerve and is sensory to Parotid Gland. => Motor fibers pass through otic ganglia without relay and supply following Muscles… i)Medial pterygoid ii)Tensor Platini iii)Tensor Tympani => Due to connection with Chorda Tympani the pathway provide an alternate pathway for T aste Sensation.

9. Clinical significance: Frey's Syndrome: =>Due to damage of Auriculotemporal nerve =>Salivation induce perspiration(sweating) =>accompanied with ERYTHEMA(reddening of skin)