Optic Radiation - Parts

Parts

A distinctive feature of the optic radiations is that they split into two parts on each side:

Source Path Information Damage
Fibers from the inferior retina (also called "Meyer's loop" or "Archambault's loop") must pass through the temporal lobe by looping around the inferior horn of the lateral ventricle. Carry information from the superior part of the visual field A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of vision in a superior quadrant (quadrantanopia or "pie in the sky" defect.)
Fibers from the superior retina (also called "Baum's loop") travel straight back through the parietal lobe to the occipital lobe in the retrolenticular limb of the internal capsule to the visual cortex. Carry information from the inferior part of the visual field Taking the shorter path, these fibers are less susceptible to damage.

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