Final Thoughts on Vitamin B12 Injections. 1  Vitamin B12 injections (or shots) are used to overcome vitamin B12 deficiency, which is common especially among the elderly, those with intestinal damage or disorders, people with pernicious anemia, and vegetarians/vegans.
Neurons communicate over long distances by sending signals called nerve impulses through the axons which make up a tract or nerve. Because each axon may branch into a whole tree, and because nerve impulses go down each branch when an axon divides, a single neuron may send signals to thousands of other neurons.
How Nerve Cells Communicate The brain makes sense of our experiences by focusing closely on the timing of the impulses that flow through billions of nerve cells By Terry Sejnowski, Tobi Delbruck Our brains are better than Google or the best robot from iRobot.