The calcarine fissure is the cerebral fold which is situated in the occipital lobe of the brain. It is also called calcarine sulcus. The calcarine sulcus begins near the occipital pole and runs up forward to a point just below the splenium of the corpus callosum, where it is joined at an acute angle by the medial part of the parietooccipital fissure.
The calcarine fissure is a part of the primary visual cortex, where the visual center of the brain is located. The central visual field is located in posterior portion of the calcarine sulcus and the peripheral visual field in the anterior portion. The amount of cortex dedicated to each square millimeter of the visual field is highly non-proportional, which means that significantly more cortex is dedicated to the processing of information originating from the fovea than other locations.
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