Nervous System
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| Nervous System has two interconnected divisions: | (CNS) Central Nervous System, (PNS) Peripheral Nervous System
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| CNS | includes brain and spinal cord (enclosed by bones of the skull and spinal column)
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| PNS | consists of the network of nerves and neural tissues branching throughout the body. 12 pairs of cranial nerves, 31 pairs of spinal nerves.Links the central nervous system with other parts of the body
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| Two principal tissue types: | Neurons (nerve cells), Neuroglia
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| Neurons | Structural and functional units of the nervous system. Specialized conductors of impulses that enable the body to interact with its internal and external environments. Specialized conductors of impulses that enable the body to interact with its internal
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| Neuroglia | (supporting tissue)
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| Motor Neurons | cause contrations in muscles and secretions from glands and organs
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| Axons | long and covered with a fatty substance, the myelin sheath that acts as an insulator and increases the trasmission velocity of the nerve fiber it surrounds.
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| Axons | may be as long as several feet and reach from the cell body to the area to be activated.
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| Dendrites | resemble the branch of a tree, are short and unsheated, transmit impulses to the cell body.
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| Nerve Fibers and Tracts | conduct impulses from one location to another
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| Central Nervous System | receives impulses from throughout the body, processes the information, and responds with appropriate action
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| Brain | governs sensory perception, emotions, consciousness, memory, and voluntary movements
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| Spinal cord | conduct sensory impulses to the brain; conduct motor impulses from the brain to body parts, and serves as a reflex center for impulses entering and leaving the spinal cord without involvement of the brain
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| Cranial Nerve | 12 pairs: provide sensory input and motor control, or a combination of these
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| Spinal Nerve | 31 pairs: carry impulses to the spinal cord and to muscles, organs and glands
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| Autonomic Nervous System | controls involuntary bodily functions such as sweating and arterial blood pressure.
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Created by:
sgaston712
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