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a deep fissure on the medial aspect of the cerebral cortex, extending on an arched line from the isthmus of the fornicate gyrus back to the occipital pole, marking the border between the lingual gyrus below and the cuneus above it. The cortex in the depth of the sulcus corresponds to the horizontal meridian of the contralateral half of the visual field.
a groove between the cuneus and the lingual gyrus on the medial surface of the occipital lobe of the brain. Also called calcarine sulcus.
The fissure extending from the occipital end of the cerebrum to the occipitoparietal fissure.
See also: fissure