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There are anatomical features that make lobe demarcations fairly non-arbitrary. From Wikipedia: by Sebastian023 There are some borders here that may be more arbitrary than others: The border between the occipital and parietal lobe between the preoccipital notch and parieto-occipital sulcus The border between the parietal and temporal lobes between the ...


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Building off of Nick Stauner's answer, the lobes are named after the cranial bones that cover them. You can see the overlap by looking at the bones of the skull (image from Wikipedia). I'm speculating now, but my guess would be that an anatomist simply picked sulci (the "valleys" in the folds of the cortical surface) that were close to the bone boundaries ...



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