Lunate sulcus

In brain anatomy, the lunate sulcus or simian sulcus, also known as the sulcus lunatus, is a fissure in the occipital lobe variably found in humans and more often larger when present in apes and monkeys. The lunate sulcus marks the transition between V1 and V2, the primary and secondary visual cortices. The lunate sulcus lies further back in the human brain than in the chimpanzee's. The evolutionary expansion in humans of the areas in front of the lunate sulcus would have caused a shift in the location of the fissure. Evolutionary pressures may have resulted in the human brain undergoing internal reorganization to develop the capability of language. It has been speculated that this reorganiz (Wikipedia)