Definition: a very deep, almost vertically oriented fissure on the medial surface of the cerebral cortex, marking the border between the precuneus portion of the parietal lobe and the cuneus of the occipital lobe; its lower part curves forward and fuses with the anterior extent of the calcarine fissure (sulcus calcarinus); the great depth of this combined fissure causes a bulge in the medial wall of the occipital horn of the lateral ventricle, the calcar avis.
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