In a patient of head injury, who presents with headache and increased intracranial pressure, the effect on pupil is:
Effect on pupil is ipsilateral mydriasis. - In this patient of head injury bleeding occurs, which increases Intra cranial pressure- This increased intra cranial pressure compresses and damages the 3rd nerve- 3rd nerve carry the parasympathetic fibers which is responsible for pupillary constriction- So, the unopposed sympathetic fibers mediated by the 5th nerve dilate the pupil - Hence patient comes with ipsilateral mydriasis Hutchinson's pupil is an ipsilateral mydriasis due to 3rd cranial nerve compression by an intracranial mass lesion including intracranial bleeds
Ipsilateral mydriasis
Contralateral mydriasis
Ipsilateral miosis
Contralateral miosis
Trauma