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refers to one of two extensions of the calcarine sulcus, where it splits into two short vertically oriented branches near the occipital pole. This is the ventrally curved inferior branch; the other is a symmetrical, dorsally curved superior calcarine sulcus. The branches are found in the macaque ( Martin-2000; Paxinos-2009a ) and, though often not named as separate structures, are illustrated in human brain atlases ( Ono-1990; Duvernoy-1992; Mai-1997 ). No comparable structures are found in the rat or mouse ( NeuroNames ).
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