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The most prominent division would be the "longitudinal fissure", which is that big line in the middle running anterior-posterior to the cerebral cortex. It was created before birth to give room to blood vessels to feed theWhen you dissect a brain you'll see those 2 sides connected by what looks like connective tissue, this tissue criss-crosses the nerves from back-to-front, meaning if you focus with your right eye, the message would be sent to the left back part of you brain.

The second would be the the parieto-occipital sulcus, which really doesn't divide the brain but is constituted as a space in between, like a cave if you must.

Another would be those to temporal lobes that pop out to the sides of the brain, looks like a helmet piece. Those are divided by the "lateral sulcus", your ears would be closest to it.

The "transverse fissure" divides the cerebellum from the cerebrum. It runs all around the lower-back(inferior-posterior) part of the cerebrum.

The pons look like balls, sits over the medulla oblongata which is the beginning of the brain stem(spinal cord). Gross fact: If you're a dude this might look familiar.

-This is just the exterior stuff. Hope this helps

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