Brain

1. The portion of the vertebrate central nervous system that is enclosed within the cranium, continuous with the spinal cord, and composed of gray matter and white matter. It is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. It is also the seat of consciousness, thought, memory, and emotion. A blow to the head can damage the brain.
2. The control center, as of a ship, aircraft, or spacecraft. That office was the brain of the ship.