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| the master controlling and communicating system of the body |
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| the process that processes and interprets the sensory input and decides what should be done |
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| ithe integrating and command center of the nervous system. consists: brain and spinal cord |
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| peripheral nervous system |
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| the part of the nervous system outside of the CNS. consists: nerves that extend from the brain & spinal cord |
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| sensory (afferent) division |
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| consists of nerve fibers that convey impulses to the central nervous system from sensory receptors |
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| motor (efferent) division |
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| transmitts impulses from the CNS to effector organs, the muscles and glands. impulses activate muscles to contract & glands to secrete. |
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| conduct impulses from the CNS to skeletal muscle. voluntary |
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| consists of visceral motor nerve fibers that regulate the activity of smooth, cardiac muscles and glands. involutary |
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| mobilizes body systems during emergency situations |
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| conserves energy, promotes nonemergency functions |
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| nonexcitable cells of neural tissue that support, protect, and insulate the neurons |
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| star-shaped, most abundant and most versatile glial cells. |
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| small ovoid cells with relatively long "thorny" processes. |
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| they line the central cavities of the brain and the spinal cord. form a fairly permeable barrier between the cerebrospinal fluid & the tissue fluit bathing the cells of CNS |
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| a type of CNS supporting cell that composes myelin sheaths |
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| surround neuron cell bodies within ganglia |
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| surround and form myelin sheaths around the larger nerve fibers in the peripheral nervous system |
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| cell of the nervous system specialized to generate and transmit nerve impulses |
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| consists of a transparent, spherical nucleus with a conspicuous nucleolus surrounded by cytoplasm |
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| also known as the soma, it contains the organelles |
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