With a history dating back about 500 million years, the oldest part of the brain is the brain stem. It is also known as the reptilian brain because even our distant ancestors had one. It is responsible for the body's's basic functions, including movement, is very slow to learn and is completely devoid of emotion.
Above it is the mid brain, which acts as a kind of control center for breathing and a variety of other reflexes. It is also connected to the cerebellum, which is responsible for physical coordination and balance. These parts of the brain have a 250-million years ago. The cerebrum is the seat of consciousness, where memories are stored, and where thoughts, wishes, intentions and ideas are formed.