There are two parietal lobes, one on each side of the brain. The frontal lobe is also where we shape emotional reactions and expressions Voluntary body movements are controlled by a region of the frontal lobe. Here, the left side of the brain is highlighted to show the control over right arm and leg movement, and the right side of the brain is highlighted to show the control over left arm and leg movement. The left side of the brain controls the muscles on the right side of the body and vice versa. The grooves and folds increase the cerebrum’s surface area, allowing us to have a tremendous amount of gray matter inside of the skull. The cerebrum is divided into left and right sides, which communicate with each other through a thin stalk of nerve fibers. It generates the most complex intellectual thoughts and controls body movement. The cerebral cortex is the outside portion of the cerebrum, also called the “gray matter”. The brain stem is the smallest and is located under the cerebellum, extending downward and back toward the neck. The cerebellum is smaller than the cerebrum and located underneath it, behind the ears toward the back of the head.
The cerebrum is the largest component, extending across the top of the head down to ear level. There are three major components of the brain. They also give us the capacity to remember numerous pieces of information. Specific groups of them, working in concert, provide us with the capacity to reason, to experience feelings, and to understand the world. The brain is composed of more than a thousand billion neurons.
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