Every nerve is made up of neurons, and there are billions of them. If all the body’s neurons were put end to end they would stretch 60 km (37 miles).
Electrical signals pass from one neuron (coloured green) to another by moving down their long extensions, which are called axons (coloured blue). Signals cross a tiny space to the receiving parts of the next neuron, which are called dendrites (also blue). Messages travel at high speeds, going all the way from the brain to the feet in 0.01 seconds.
Ultimately, biological neuron models aim to explain the mechanisms underlying the operation of the nervous system for the purpose of restoring lost control capabilities such as perception (e.g. deafness or blindness), decision making, and continuous limb control.
Picture Credit : Google