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Facial nerve and its disorders

Question
13 out of 33
 

Crocodile tears is due to: (Delhi 2009)



A Cross innervation of facial nerve fibers

B Cross innervation of trigeminal nerve fibers

C Improper regeneration of trigeminal nerve

D Improper regeneration of facial nerve

Ans. D improper regeneration of facial nerve

Crocodile tears (gustatory lacrimation) There is unilateral lacrimation with mastication

a. It is due to faulty regeneration of parasympathetic fibres which normally travel through chorda tympani but are misdirected towards greater superficial petrosal nerve and instead of going to salivary glands reach the lacrimal glands.

This results in unilateral lacrimation with mastication

b. Treatment - Sectioning the greater superficial petrosal nerve or tympanic neurectomy

Also Know

• Frey's syndrome (gustatory sweating) - There is sweating and flushing of skin over the parotid area during mastication.

Remember:

Irreversible axonal injury and aberrant patterns of regeneration are more common from grade III degree of sunderland classification of facial nerve deqeneration?

Facial nerve and its disorders Flashcard List

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