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.
Farlex Partner Medical Dictionary © Farlex 2012
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In extant primate brains, this is manifest by the position of the lunate sulcus, the anterior boundary of the primary visual striate cortex.
Holloway, "The Past, Present, and Future Significance of the Lunate Sulcus in Early Hominid Evolution," in Hominid Evolution: Past, Present, and Future, ed.
Holloway, "The Past, Present, and Future Significance of the Lunate Sulcus in Early Hominid Evolution," in Brain Endocasts--The Paleoneurological Evidence, ed.