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23 Cards in this Set
- Front
- Back
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Central Nervous System
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CNS-brain and spinal cord
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Peripheral Nervous system
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PNS-cranial and spinal nerves
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Neurons
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functional units of NS
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Glial cells
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support neurons and maintain homeostasis
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Neurons gather and transmit info. by?
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responding to stimuli
Producing and sending electrochemical impulses Releasing chemical messages |
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Dendrites
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receive infromation
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Axons
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conduct impulses away from cell body
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Axoplasmic flow
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moves soluble compounds slowly toward nerve endings
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Axonal transport
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moves large and insoluble compounds bidirectionally along microtubules
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Sensory/Afferent neurons
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conduct impulses into CNS
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Motor/Efferent neurons
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carry impulses out of CNS
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Association/Interneurons
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intergrate NS activity
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Schwann Cells
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form myelin sheaths around peripheral axons
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Satellite cells
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support neuron cell bodies within the ganglia of the PNS
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Oligodendrocytes
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form myelin sheaths around axons of the CNS
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Microglia
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migrate through the CNS and phagocytes foreign and degenerated material
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astrocytes
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help to regulate the external environment of neurons in the CNS
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ependymal cells
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line the ventricles of the brain and the central canal of the spinal cord
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Node of Ranvier
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gaps in the myelin sheaths
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Blood brain Barrier
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allows only certain compounds to enter brain
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Depolarization
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occurs when MP (membrane potential) becomes more positive (activated)
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Hyperpolarization
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MP becomes more negative than RMP
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Repolarization
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MP returns to RMP (resting)
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