The otic ganglion is a parasympathetic ganglion located in the infratemporal fossa just below the foramen ovale. It is oval shaped and reddish grey in color. It has connections to the mandibular nerve, glossopharyngeal nerve, and middle meningeal artery. The otic ganglion plays a role in parasympathetic innervation of lacrimal and salivary glands as well as sympathetic innervation of the parotid gland. Damage to the auricotemporal nerve can cause Frey's syndrome, where facial sweating is induced by eating.

1. By:- Pradeep Tyagi
MBBS 1st 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

7. Otic ganglia
Parasympathetic Ganglia
Topographically;
Mandibular nerve
Functionally
Glossopharyngeal nerve

8. Connections
4 types of connection
Parasympathetic
Sympathetic
Sensory
Somatic motor

10. 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.

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

13. 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

14. Other connections
 Alternate pathway of
taste
 Buccal nerve

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

16. Reference
Gray’s Anatomy
Vishram Singh
B.D. Chaurasia