lunate sulcus

lu·nate sul·cus

a small, inconstant semilunar groove on the cortical convexity near the occipital pole, marking the anterior border of the striate cortex (Brodman area 17) and considered homologous with the major sulcus of the same name that is a more constant feature of the cerebral cortex in monkeys and apes.
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Ralph Holloway and coworkers have long defended the notion that this landmark is positioned in australopithecines similarly to that of modern humans, indicating significant reduction of the primary visual cortex and the accompanying reorganization of the australopithecine brain architecture relative to apes, while Dean Falk and coworkers have argued that the position of the lunate sulcus in australopithecines is essentially ape-like.
Holloway, "The Past, Present, and Future Significance of the Lunate Sulcus in Early Hominid Evolution," in Hominid Evolution: Past, Present, and Future, ed.