Andrew Huberman· PhD
As a neuroscientist, what I know about them is that they are present everywhere in neurons. Not just in the so-called cell body, but you can find mitochondria in the furthest little bits of neurons. And neurons can be quite big, very large. In fact, meters long or more in some cases and some species, including us. Depending on how tall somebody is, could be many meters-- or several meters rather.