In this article you will find a general explanation of brain regions with brain anatomy illustrations to help eludicidate the structure of the brain.


The brain is a command center. It receives input from the nervous system through all the regions of the body and incorporates information from sensory organs. Then it processes and sends output signals to the muscles.

  • The human brain weighs about 3.3 lbs (1.5 kg), and makes up about 2 percent of a human’s body weight. The human brain is the largest brain of all vertebrates relative to body size.  This is very loosely a sign of intelligence (intelligent animals such as crows, are an exception).
  • The human brain contains about 86 billion nerve cells, or neurons, which make up the “grey matter” of the brain.
  • Myelin is the sheath that surrounds the axons of nerves, and is responsible for speeding up the nerve signals in a focused direction, like rubber around a wire.