Hutchinson's pupil is a clinical sign in which the pupil on the side of an intracranial mass lesion is dilated and unreactive to light,[1] due to compression of the oculomotor nerve on that side. The sign is named after Sir Jonathan Hutchinson. These can be due to concussion injury to the brain and is associated with subdural haemorrhage and unconsciousness. The parasympathetic fibers to the pupil are responsible for pupillary constriction. The fibers pass through the periphery of the oculomotor nerve, and hence are the first to be affected in case of compression of the nerve. In Stage 1, the parasympathetic fibers on the side of injury are irritated, leading to constriction of pupil on that side. In stage 2, the parasympathetic fibers on the side of injury are paralysed, leading to dilatation of pupil. The fibers on the opposite oculomotor nerve are irritated, leading to constriction on opposite side. In stage 3, the parasympathetic fibers on both sides are paralysed - leading to bilateral pupillary dilatation. Pupils become fixed. This indicates grave prognosis.[citation needed]
hutchinson, pupil, clinical, sign, which, pupil, side, intracranial, mass, lesion, dilated, unreactive, light, compression, oculomotor, nerve, that, side, sign, named, after, jonathan, hutchinson, these, concussion, injury, brain, associated, with, subdural, h. Hutchinson s pupil is a clinical sign in which the pupil on the side of an intracranial mass lesion is dilated and unreactive to light 1 due to compression of the oculomotor nerve on that side The sign is named after Sir Jonathan Hutchinson These can be due to concussion injury to the brain and is associated with subdural haemorrhage and unconsciousness The parasympathetic fibers to the pupil are responsible for pupillary constriction The fibers pass through the periphery of the oculomotor nerve and hence are the first to be affected in case of compression of the nerve In Stage 1 the parasympathetic fibers on the side of injury are irritated leading to constriction of pupil on that side In stage 2 the parasympathetic fibers on the side of injury are paralysed leading to dilatation of pupil The fibers on the opposite oculomotor nerve are irritated leading to constriction on opposite side In stage 3 the parasympathetic fibers on both sides are paralysed leading to bilateral pupillary dilatation Pupils become fixed This indicates grave prognosis citation needed Hutchinson s pupilDifferential diagnosisIntracranial mass lesionReferences edit Dr Aruj Khurana Concussion injuries to the brain Comprehensive Ophthalmology fourth ed New Age International P 311 External links editHutchinson s pupil at Who Named It nbsp This medical sign article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Hutchinson 27s pupil amp oldid 1039079545, wikipedia, wiki, book, books, library,
