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nervous tissue
Nervous tissue is the main component of the two parts of the nervous system; the brain and spinal cord of the central nervous system (CNS), and the branching peripheral nerves of the peripheral nervous system (PNS), which regulates and controls bodily functions and activity. It is composed of neurons, or nerve cells, which receive and transmit impulses, and neuroglia, also known as glial cells or more commonly as just ''glia'' (from the Greek, meaning glue), which assist the propagation of the nerve impulse as well as providing nutrients to the neuron.
Nervous tissue is made up of different types of nerve cells, all of which have an axon, the long stem-like part of the cell that sends action potential signals to the next cell.
Functions of the nervous system are sensory input, integration, control of muscles and glands, homeostasis, and mental activity.
==Structure==
Nervous tissue is composed of neurons, also called nerve cells, and neuroglial cells. Typically, nervous tissue is categorized into four types of tissue. In the central nervous system (CNS), the tissue types found are grey matter and white matter. In the peripheral nervous system (PNS), the tissue types are nerves and ganglia. The tissue is categorized by its neuronal and neuroglial components.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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