Every thought and action is controlled by the brain — the body’s most complex organ. The brain is divided into functional units with particular tasks, like processing visual information or responding to fearful experiences. Each of these units is made up of brain cells that work together. These cells also form connections with cells in other functional units, creating communication routes for brain signals. Using new tools to tag and trace brain circuits, scientists are working to better understand how the human brain is organized to perform its many functions. Ongoing studies in animals and people are helping scientists recognize the many different types of brain cells and the roles they play. In addition, imaging technology is helping map brain regions responsible for specific functions and behaviors.
- From BrainFacts.org (http://www.brainfacts.org/brain-basics/neuroanatomy/)