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26 Cards in this Set
- Front
- Back
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What is the subdivision of the PNS that regulates involuntary functions?
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Autonomic Nervous System (ANS)
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What are the divisions of the nervous system?
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Central Nervous System (CNS)
Peripheral Nervous System (PNS) |
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What makes up the central nervous system?
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Brain and Spinal Cord
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What makes up the peripheral nervous system?
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All the nerves that extend to outlying or peripheral parts of the body.
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What are the divisions of the peripheral nervous system?
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Autonomic Nervous System
Somatic Nervous System |
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What is the function of the automomic nervous system?
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Regulates involuntary functions
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What is the function of the somatic nervous system?
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Motor neurons that control the voluntary actions of skeletal muscles
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Transmits impulses to the spinal cord
(afferent) |
Sensory neurons
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Transmits impulses away from the brain & spinal cord. Conducts impulses to muscles.
(efferent) |
Motor neurons
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Conducts impulses from sensory to motor neurons.
Aka: central or conducting neurons |
Interneurons
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Where are interneurons primarily found?
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The brain and the spinal cord.
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What releases chemical messengers called transmitters?
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Axon terminals
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How fast do neuron impulses travel?
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360 feet per second
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What receives & transmits impulses to the neuron cell body?
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Dendrites
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What is the main part of the cell called?
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Cell body
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What transmits impulses away from the cell body?
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Axon
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What is the whole line of schwann cells called?
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myelin sheath
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What is a fatty, white substance that covers the axon?
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Myelin sheath
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Myelin controls the speed of what?
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The speed at which a nerve imulse travels?
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What are the indentations between adjacent schwann cells?
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Nodes of Ranvier
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Support cells, brings the cells of nervous tissue together structurally and functionally?
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Glia
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Do not specialize in sending impulses. Supporting cells. Helps nervous tissue function as a whole, holds funtioning neurons together & protects them.
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Glia
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What are the 3 types of glia in the central nervous system?
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1)Astrocytes
2)Microglia 3)Oligodendroctes |
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What attaches to neurons & smaller blood vessels making up the blood-brain barrier?
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Astrocytes
(only in the blood-brain barrier) |
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What remains stationary unless there is "deteriorating" brain tissue or inflamation?
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Microglia
(performs phagocytosis |
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What produces the myelin sheath that envelopes neurons in the brain & spinal cord?
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oligondendroctes
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