<prompt> Facial nerve palsy at sternomastoid canal can cause-Loss of corneal reflex at side of lesionLoss of taste sensation anterior 23 of ipsilateral tongueLoss of lacrimation at side of lesionHyperacusis  <response>: 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 spareGreater superficial petrosal nerve Lacrimation present.Nerve to stapedius Normal stapedial reflex and no hyperacusis.Chorda tympani Normal salivation and a taste sensation in anterior 23 of the tongue.ii Will involveTerminal 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. 