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why does a pupil dialte in uncal herniation?
compression of oculomotor nerve causes oculomotor nerve palsy
- ptosis of eyelid (unopposed action of obicularis oculi, paralysis of levator palpebrae superioris)
- fully dialatd eye (unopposed action fo dilator pupillae as parasympathetic output from the oculomotr nerve is damaged which would cuase vasoconstriciton
- fullly abducted and depressed eye due to unopposed aciton fo the lateral rectus and superior oblique, abduction occurs due to alteral rectus, and depression occurs due to superior oblique; paralysed superior rectus and inferior oblique
- ptosis of eyelid (unopposed action of obicularis oculi, paralysis of levator palpebrae superioris)
- fully dialatd eye (unopposed action fo dilator pupillae as parasympathetic output from the oculomotr nerve is damaged which would cuase vasoconstriciton
- fullly abducted and depressed eye due to unopposed aciton fo the lateral rectus and superior oblique, abduction occurs due to alteral rectus, and depression occurs due to superior oblique; paralysed superior rectus and inferior oblique
