The brain is the major part of central nervous system and is well protected in the cranium of skull. Each area of our brain has a specific job and no area can work alone as it works in coordination.
The weight of our brain is about 3 pounds and its size about the size of a grapefruit. The brain is made up of many billions of neurons and brain is covered with folds and groves. These grooves divide the brain into different parts with different functions. The brain can be divided into three parts. Each part controls different activities.
The first part is “cerebrum”. It is the largest part of the brain. This part receives sensory information from eye, ear, mouth, hose and skin, processes it, stores some information in memory for future use, direct voluntary movements and is responsible for the poorly understood process that we call thinking.
This is also involved in intelligence, reasoning and judgment dreaming and feeling. This area is also involved in speech.
Another part of brain is “Cerebellum”. It is important in coordinating movements of the body such walking running and painting a picture. It guides smooth and accurate motions and body positions. It is also involved in the learning and memory storage for behaviors. The third part of the brain is brain stem. It controls involuntary movements. It is like a basic life support system. It controls several automatic functions such as breathing, heart beat, blood pressure and swelling.
The spinal cord is the centre for great many reflexes and it serves as a pathway for conduction of impulses to and from different parts of the body and brain.