Child health · UKMLA & AKT
Quadrantanopia
A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise quadrantanopia — the full SA Note notes add investigations, management, complications and 10 practice questions.
Key high-yield points
- Optic radiation splits after the LGN into two bundles travelling through different lobes - focal lesions disrupt only one bundle, producing a quadrant defect rather than full hemianopia
- Meyer's loop (temporal lobe) - carries lower retinal fibres = upper visual field information; loops anteriorly through temporal lobe to lower calcarine sulcus
- Parietal fibres - carry upper retinal fibres = lower visual field information; travel superior route through parietal lobe to upper calcarine sulcus
- All post-chiasmal lesions → homonymous defects, contralateral to the lesion
PITS mnemonic: Parietal → Inferior quadrantanopia; Temporal → Superior quadrantanopia
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