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.
There are two types of neurons ââ the sensory neurons and the motor neurons. Sensory neurons send signals to the brain and the spinal cord, while the motor neurons receive signals from the brain and spinal cord. Therefore, information is transmitted through neurons by electrochemical signaling.here are two types of neurons ââ the sensory neurons and the motor neurons. Sensory neurons send signals to the brain and the spinal cord, while the motor neurons receive signals from the brain and spinal cord. Therefore, information is transmitted through neurons by electrochemical signaling.