Did the other organs all move together into their location, how did the brain get left out?
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The positions of organs go back a LONG way, almost to the begging of animals. Most mobile animals have sensory organs in the front because that’s where they’re useful, the brain (or at least the closest analogue) right next to them (because it makes functional sense, neurons do have a limited “speed”), and then other organs throughout the rest of the body. But nerves are fairly fragile, and some groups of animals developed protection for them (or for the whole body, in the case of exoskeletons), which obviously also protected the brain. And as the brain grew, so did it’s protection, you end up with a head. Then evolve a neck, because it’s useful to be able to move your sensory organs and mouth around, and you end up with something like an ant or a mammal, with a brain in a clearly separate head.
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