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gathered information; stimuli that the nervous system receives from the external or internal environment
Central Nervous System
consists of the brain and spinal cord. They interpret incoming sensory information and issue instructions
Peripheral Nervous System
the part of the nervous system outside the CNS, consists mainly of the nerves that extend from the brain and spinal cord
consists of nerve fibers that convey impulses to the central nervous system from sensory receptors located in various parts of the body
carries impulses from the CNS to effector organs. These impulses activate muscles and glands
Autonomic Nervous System
regulates events that are automatic, or involuntary, such as the activity of smooth and cardiac muscles and glands
includes many types of cells that generally support, insulate, and protect the delicate neurons. "Nerve glue"
abundant star-shaped cells that account for nearly half of the neural tissue. Form a living barrier between capillaries and neurons and play a role in making exchanges between the two
these glial cells line the cavities of the brain and the spinal cord. The beating of their cilia helps to circulate the cerebrospinal fluid that fills those cavities and forms a protective cushion around the CNS
glia that wrap their flat extensions tightly around the nerve fibers, producing fatty insulating coverings called myelin sheaths
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