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The Human Nervous System

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NERVOUS SYSTEM
The nervous system is the complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.

CENTRAL NERVOUS SYSTEM
The Central NS is made up of the brain and spinal cord
BRAIN
The brain lies within the skull and is shaped like a mushroom. The brain consists of four principal parts: * the brain stem * the cerebrum * the cerebellum * the diencephalon

The brain weighs approximately 1.3 to 1.4 kg. It has nerve cells called the neurons and supporting cells called the glia.
There are two types of matter in the brain: grey matter and white matter. Grey matter receives and stores impulses. Cell bodies of neurons and neuroglia are in the grey matter. White matter in the brain carries impulses to and from grey matter. It consists of the nerve fibers or the axons. * The brain stem
The brain stem is also known as the Medulla oblongata. It is located between the pons and the spinal cord and is only about one inch long. * The cerebrum
The cerebrum forms the bulk of the brain and is supported on the brain stem. The cerebrum is divided into two hemispheres. Each hemisphere controls the activities of the side of the body opposite that hemisphere.
The hemispheres are further divided into four lobes: * Frontal lobe * Temporal lobes * Parietal lobe * Occipital lobe

* The cerebellum
This is located behind and below the cerebrum.

* The diencephalon
The diencephalon is also known as the fore brain stem. It includes the thalamus and hypothalamus. The thalamus is where sensory and other impulses go and coalesce.
The hypothalamus is a smaller part of the diencephalon

AUTONOMOUS NERVOUS SYSTEM

This nervous system controls the nerves of the inner organs of the body on which humans have no conscious control. This includes the heartbeat,...

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