QS Study

The otic ganglion is a peripheral parasympathetic ganglion which is a relay station for the secretomotor fibers to the parotid gland. It is one of four parasympathetic ganglia of the head and neck. It receives parasympathetic fibers from the glossopharyngeal nerve.

Situation: It is situated in the infratemporal fossa, just below the foramen ovale.

Size: About 2-3mm in size.

Relation:

  • Medially- Tensor Palati muscle,
  • Literally – Mandibular nerve.

Gross anatomy

  • small and disc-shaped
  • located in the infratemporal fossa
  • it lies immediately below the foramen ovale, medial to the mandibular division of the trigeminal nerve
  • supplies secretomotor fibers to the parotid gland.

Otic Ganglion 1

Fig: Otic Ganglion

Communications

(A) Parasympathetic:

  1. Preganglionic fibers from the inferior salivary nucleus come to the ganglion.
  2. Postganglionic fibers pass to the parotid gland.

(B) Sympathetic:

  1. Afferent fibers through tympanic plexus.
  2. Efferent to the parotid gland.

(C) Sensory:

  1. Afferent comes through the auriculotemporal nerve.
  2. Efferent fibers are general sensory to the parotid gland.
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