The superior optic radiation or superior geniculocalcarine tract, also known by its eponymous name Baum’s loop, is the posterior/superior fibres of the optic radiation. These superior fibres pass dorsally and posteriorly from the lateral geniculate nucleus through the retrolentiform internal capsule and parietal lobe to the superior margin of the calcarine sulcus (lingual gyrus, occipital lobe). This region forms part of the primary visual cortex.
Damage of this pathway on the left can result in a homonymous lower right visual field quadrantanopia, a.k.a. "pie-in-the-floor defect".
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