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.
While neurons do not reproduce, research has shown that  new connections between neurons form throughout life.  Neurons have a membrane that is designed to sends information  to other cells. The axon and dendrites are specialized structures  designed to transmit and receive information.The connections  between cells are known as a synapses. neurons (nerve cells) divide by mitosis just like most other cells but in humans neurons in the central nervous system (brain and spinal cord) stop dividing after fetal development. 3 people found this useful.