Autonomics of Head & Neck

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Flashcards

CN III PANS

Constriction of pupil

CN III SANS

Pupillary dialation

Accommodation reflex

CN III - Mediated via regulation of the cillary body - PANS ONLY

Tear secretion

CN VII - PANS

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Secretion and inhibition of saliva

CN VII PANS - secretes saliva SANS - inhibits secretion

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Secretion of mucous from nasal and oral cavities

CN VII - PANS will stimulate secretion CN VII - SANS will inhibit secretion

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Sweat glands of the head and neck innervation for heat dissipation

SANS only - thus coming from T1-T3 spinal cord levels NO PANS

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What is the asterisk showing?

PRE-ganglionic SANS originating from T1-T3 (inter-medial cell column of the lateral horn)

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Most PRE-ganglionic SANS fibers will ascend via what?

Sympathetic trunk

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Where do the PRE-ganglionic SANS head and neck fibers synapse?

Superior cervical ganglia

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Where is the sympathetic trunk located?

Pre-vertebral fascia

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Below the oral fissure, PRE-ganglionic PANS from CN VII travel from where?

Chorda tympani nerve --> middle ear --> exits via petrotympanic fissure --> Chorda tympanic w/lingual nerve at IT Fossa

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The fibers for lens accommodation and pupillary constriction synapse where?

Cilliary ganglion

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The fibers for tear secretion synapse where?

Pterygopalatine ganglion (CN VII)

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