1. In our central nervous system, there are more than millions of nerve cells—100 billion neurons in the human brain and about 13,500,000 neurons in the spinal cord.
2. The longest and widest single nerve in the human body is the sciatic nerve. It begins or originates from the spine in the lower back and runs through the buttocks and down towards the lower limb until the toe. The sciatic nerve functions by delivering sensation to the skin of the sole, lower leg, and upper surface of the foot.
3. Vitamin B, Sodium, proteins, and other mineral ions, including potassium, magnesium, and calcium ions, are equally essential nutrients required for maintaining the healthy and proper functioning of our nervous system.
4. Nerve damage is usually irreversible and can result in the loss of function of any nerve in the body. This is because the nerve cells do not undergo the process of cell division, and therefore they cannot grow or repair themselves.
5. The optic nerve, also known as the cranial nerve, is the fundamental part of the central nervous system and the most significant sensory nerve in the human eye. The structure of the eye mainly comprises millions to billions of optic nerve fibers, which are involved in transmitting visual information from the eye to the brain.
6. The nervous system is the primary control system of our body, as it is involved in every function, from breathing to generating and receiving responses to controlling the muscles and sensing heat, cold, and a lot more.
7. Damage to the nervous system may result in the malfunction of other systems. The nervous system is essential to the human body, as it provides the ability to interact with the world.
8. The fastest signal transmission in the human body occurs through alpha motor neurons. It is the largest, multipolar lower motor neuron of the brainstem and spinal cord. The signal transmission occurs at 260 to 268 miles per hour.
9. The slowest signal transmission in the human body occurs within the skin. It is the largest organ of the body and has sense organs, that transmit signals at 1 mile per hour.
10. The human nervous system starts to shrink as we grow older. The loss of neurons is the main reason why the human brain shrinks with age, by about 1 to 2 grams per year.