The nervous system is the major controlling, regulatory, and communicating system in the body. It is the centre of all mental activity including thought, learning, and memory. Our whole body governs through P (Psycho) – N (Neuro)-E (Endocrine)-I (Immuno) Axis. Together with the endocrine system; the nervous system is responsible for regulating and maintaining homeostasis. Through its receptors, the nervous system keeps us in touch with our environment, both external and internal. Like other systems in the body, the nervous system is composed of organs, principally the brain, spinal cord, nerves, and ganglia.
In today modern, overuse of computers and other gazettes, overstress, overexertion, to achieve many more things into a short span of life, leads to produce brain fag (weakness to the nervous system leads to produce weakness of body). It also leads to produce Vit B12 Deficiency. This is the most common problem that occurs now a day.