<prompt> Facial nerve palsy at sternomastoid canal can cause:Loss of corneal reflex at side of lesionLoss of corneal taste sensation anterior 23 of ipsilateral tongueLoss of lacrimation at side of lesionHyperacusis  <response>: Ans. A Loss of Corneal reflex at the side of lesionCourse of Facial NerveBelow 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 forameni. 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 23 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: Afferent: Trigeminal nerveEfferent: Peripheral branches of facial nerve 