The human brain is an awesome thing. Weighing in at about 3-pounds, the organ is comprised of something like 86 billion neurons, each comprised of a stoma or cell body, an axon to take information away from the cell, and anywhere between a handful and a hundred thousand dendrites bringing information in. Chemical signals transmit information over minute gaps between neurons called synapses, about 1/25,000th to 1/50,000th of the thickness of a sheet of paper.
There are roughly a quadrillion such synapses, meaning that any given thought could wend its way through more pathways than there are molecules in the known universe. This is roughly the case, whether you are Stephen J. Hawking, or Forrest Gump.
Figure Dendrites. Cell body. Nucleus. Axon hillock. Axon. Signal direction. Synapse. Myelin sheath. Synaptic terminals. Presynaptic cell. Postsynaptic cell.
For all of this, the brain cannot store either oxygen or glucose (blood sugar), meaning…