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Nervous System Essay

708 words - 3 pages

The Nervous System is the system of cells, tissues, and organs that regulates the body's responses to internal and external stimuli. In vertebrates it consists of the brain, spinal cord, nerves, ganglia, and parts of the receptor and effector organs.
Your nervous system is composed of the central nervous system, the cranial nerves, and the peripheral nerves. The brain and spinal cord together form the central nervous system. The cranial nerves connect the brain to the head. The four groups of nerves that branch from the cervical, thoracic, lumbar, and sacral regions of the spinal cord are called the peripheral nerves.
The peripheral nervous system consists of sensory neurons running from ...view middle of the document...

The brain is a pinkish mass that is composed of about 10 billion nerve cells. The nerve cells are linked to each other and together are responsible for the control of all mental functions.
The brain is divided into three major parts, the hindbrain, the midbrain, and the forebrain. The cerebrum occupies the topmost portion of the skull. It is by far the largest part of the brain. It makes up about 85% of the brain's weight. The cerebrum is split vertically into left and right hemispheres. Its upper surface, the cerebral cortex, contains most of the master controls of the body. In the cerebral cortex ultimate analysis of sensory data occurs, and motor impulses originate that initiate, reinforce, or inhibit all of the muscle and gland activity. The left half of the cerebrum controls the right side of the body; the right half controls the left side. The Midbrain joins the diencephalons and the medulla oblongata. It has centers that control movements of the eyes and of other part of the body. The hindbrain lies toward the back and base of the skull. It includes the medulla oblongata and cerebellum. The cerebellum consists of two hemispheres....

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