otic ganglion.pptx

Otic ganglia, introduction,roots or connection, clinical significance

1. OTIC GANGLION By:- Pradeep Tyagi MBBS 1 st Year Roll no :- 63

2. CONtENTS INTRODUCTION LOCATION AND RELATIONS TOPOGRAPHIC AND FUNCTIONAL RELATION ROOTS OR CONNECTIONS CLINICAL SIGNIFICANCE

3. Introduction Parasympathetic ganglia 2-3 mm in diameter Oval shaped Reddish grey colour

4. Location Infratemporal fossa Just below foramen ovale, between tensor palati and mandibular nerve.

5. Relation Lateral: mandibular nerve Medial: tensor palati muscle Posterior: middle meningeal artery Anterior: medial pterygoid muscle

6. Otic ganglia Parasympathetic Ganglia Topographically; Mandibular nerve Functionally Glossopharyngeal nerve

7. Connections 4 types of connection Parasympathetic Sympathetic Sensory Somatic motor

8. Sympathetic Post ganglionic fibres arising in Superior cervical ganglia. Sympathetic root derived from plexus around Middle meningeal artery. Fibres cannot relay in otic ganglia and reach parotid gland via Auricotemporal nerve. Fibres are vasomotor in function.

9. The tympanic plexus innervates the mucous membrane lining the walls and content of middle ear. Formed by tympanic nerve, a branch of glossopharyngeal nerve.

10. Sensory and somatic motor Sensory root comes from Auricotemporal nerve. Motor fibres pass through otic ganglion without relay and supply following muscles - tensor palati - tensor tympani

11. Other connections Alternate pathway of taste Buccal nerve

12. Clinical significance Frey’s Syndrome Due to damage of Auricotemporal nerve. Salvation induce perspiration(sweating). Accompanied with erythema(reddening of skin).

13. Reference Gray’s Anatomy Vishram Singh B.D. Chaurasia