Facial nerve palsy at sternomastoid canal can cause-
Correct Answer: Loss of corneal reflex at side of lesion
Description: Below stylomastoid foramen, facial nerve gives following branches: - Posterior auricular branch, muscular branches (stylohyoid & posterior belly of digastric) and terminal (peripheral) branches.
Lesion at sternomastoid foramen : -
i) Will spare
Greater superficial petrosal nerve → Lacrimation present.
Nerve to stapedius → Normal stapedial reflex and no hyperacusis.
Chorda tympani → Normal salivation and a taste sensation in anterior 2/3 of the tongue.
ii) Will involve
Terminal (peripheral) branches → Paralysis of muscles of facial expression. Corneal reflex will also be lost because efferent fibres of corneal reflex are derived from peripheral branches of the facial nerve.
Category:
ENT
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