The human nervous system is divided into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which includes the cranial nerves, arising from the brain, and the spinal nerves, arising from the spinal cord. The basic functional units in our nervous system are the nerve cells (neurons) and glial cells (glia). There are about 100 billion neurons in the human brain. Neurons present a great variety of sizes and shapes. Most of them possess a long process called the axon and a main body known as the cell body or soma. Neurons also possess a series of smaller processes called dendrites. The principal function of the neuron is to communicate information. The dendrites of the neurons receive information from other neurons, and this information is passed to the soma, where the information can be modified and then passed along to other neurons via the axon. [download]
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