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Facial nerve and its disorders

Question
9 out of 33
 

Facial nerve palsy at sternomastoid canal can cause: [AIIMS May 2011]



A Loss of corneal reflex at side of lesion

B Loss of corneal taste sensation anterior 2/3 of ipsilateral tongue

C Loss of lacrimation at side of lesion

D Hyperacusis

Ans. A Loss of Corneal reflex at the side of lesion

Course of Facial Nerve

Below stylomastoid formen, facial nerve gives following branches: Posterior auricular branch, muscular branches (stylohyoid and posterior belly of diagastric) and terminal (peripheral) branches.

Lesion at sternomastoid foramen

i. Will spare:

- Greater superficial petrosal nerve -7 Lacrimation present.

- Nerve to stapedius -7 Normal stapedial reflex and no hyperacusis.

- Chorda tympani -7 Normal salivation and taste sensation in anterior 2/3 of tongue.

ii. Will involve:

Terminal (peripheral) branches -7 Paralysis of muscles of facial expression. Corneal reflex will also be lost because efferent fibres of corneal reflex are derived from peripheral branches of facial nerve (it is a LMN type lesion).

Remember:

Corneal Reflex: Afficient: Trigeminal nerve

Efferent: Peripheral branches of facial nerve

Facial nerve and its disorders Flashcard List

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