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30 Cards in this Set
- Front
- Back
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Nervous System?
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communicating system of the body
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Sensory Input?
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afferent info
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Motor Output?
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efferent info
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What does the peripheral nervous system contain? 2
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cranial nerves
spinal nerves |
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Somatic Nervous System?
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voluntary
conducts impulses from CNS to skeletal muscle |
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Autonomic Nervous System?
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involuntary
conducts impulses from CNS to cardiac muscles, smooth muscles, and glands |
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What are the 2 divisions of the Autonomic Nervous System?
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Sympathetic
Parasympathetic |
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Role of sympathetic division?
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mobilizes body systems during emergency situations
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Role of Parasympathetic division?
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conserves energy
promotes non emergency functions |
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What are the supporting cells? 3
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Neuroglia (CNS)
Schwann cells (PNS) Satallite cells (PNS) |
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What are the cells of the nervous system? 2
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neurons
supporting cells |
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What are neurons?
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excitable cells that transmit an electrical signal or action potential
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What do neurons require?
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a continuos and abundant supply of oxygen and glucose
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What are the 3 classifications of neurons?
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bipolar
pseudo-unipolar multipolar |
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ratio of supporting cells to neurons?
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10:1
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What are the role of astrocytes (neuroglia)? 3
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exchange between ca[illaries and neurons
control chemical environment take up neurotransmitters |
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What are the roles of Microglial cells (neuroglia)? 2
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monitor the health of neurons
phagocytic |
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What are the roles of Ependymal cells (neuroglia)? 2
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help form CSF
help circulate CSF |
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What is the role of Oligodendrocytes (neuroglia)?
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form myelin sheath in the CNS
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Role of Satellite cells?
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surround the cell bodies of neurons in ganglia, supportive to neurons
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Role of Schwann cells?
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form the myelin sheath in the PNS
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What factors affect the conduction velocity?
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axon diameter
myelin sheath |
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How does axon diameter affect conduction velocity?
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the larger the diameter of the axon the faster it will conduct a current
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Saltatory conduction?
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conduction that jumps
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Diameter and degree of myelination of somatic and motor fibers?
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largest diameter and degree of myelination, fastest conduction
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Diameter and degree of myelination of innervate the viscera and pain fibers from the skin?
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lightly myelinated
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Diameter and degree of myelination of visceral and some pain and touch?
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smallest diameter, unmyelinated, slowest conducting
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Epineurium?
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covers entire nerve
outtermost layer |
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Perineurium?
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middle layer
covers fascicles |
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Endoneurium?
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inner layer
covers individual processes of a neuron |
