skip to main content

Meyer's Loop – Superior Quadrantanopia — SCE Neurology MCQ

Instant feedback + full explanation. One question, done properly.

EasyNeuro-ophthalmologyMeyer's Loop – Superior QuadrantanopiaSCE Neurology

A 55-year-old man presents with a progressive right superior quadrantanopia. MRI brain shows a lesion in the left temporal lobe involving the anterior part of the optic radiation. What visual field pattern and anatomical structure are affected?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: C — Right superior quadrantanopia — Meyer's loop (anterior temporal optic radiation)

Meyer's loop is the anterior temporal portion of the optic radiation that sweeps forward into the temporal lobe before looping back to the occipital cortex. It carries fibres from the inferior retina (representing the superior visual field). Damage to Meyer's loop in the left temporal lobe causes a right (contralateral) superior quadrantanopia — the 'pie in the sky' defect. A: Parietal optic radiation damage causes inferior quadrantanopia. C: Optic tract lesions cause complete contralateral hemianopia. D: Chiasm lesions cause bitemporal hemianopia. E: Right occipital lesions cause left hemianopia.

Reference: Clinical Neuroanatomy