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Reverse signals (dendrite -> axon) do occur in neurons, and are called back propagating action potentials (bAPs). However, whatever role bAPs play in the nervous system at large is subtle/small enough that we don't really understand them at all. In any case, as @luigi points out, pinched nerves don't have anything to do with bAPs. The reason why a pinch in ...


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I think this website provides a pretty surprisingly thorough breakdown of avian brain anatomy, including historical contexts and debate around what exactly is homologous and what is not, and whether 'homologous' is a useful bit of information. In short: It was thought until recently that the bird brain was just the core of the mammal brain with some layers ...



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