The human brain is the master organ of the body. The brain takes in all information relating to the body’s internal and external environments, and it produces the appropriate responses. In humans, the nervous system is divided into the central nervous system (CNS), which consists of the brain and spinal cord, and the peripheral nervous system (PNS), which contains all the nerves that run everywhere in the body.
The human brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses and receives input from the sensory organs and sends output to all the muscles of our body. Other facts about the brain:
The human brain is the largest brain of all vertebrates relative to body size
It weighs about 3.3 lbs. (1.5 kilograms)
The brain makes up about 2 percent of a human's body weight
The cerebrum makes up 85 percent of the brain's weight
It contains about 86 billion nerve cells (neurons) — the "gray matter"
It contains billions of nerve fibers (axons and dendrites) — the "white matter"
These neurons are connected by trillions of connections, or synapses
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