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23 Cards in this Set
- Front
- Back
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Describe and differentiate two nerve impulse mechanisms.
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Action Potential (electrical), Wave Propagation (chemical)
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Explain wave propagation and salutatory conduction processes.
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Ion flow and membrane action potential
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Describe the anatomical structure of the nerve.
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Soma, one axon, multiple dendrites, terminal bouton, axon hillock, myelin stealth/node of R.
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Explain the mechanism of signal transmission from a nerve to a post–synaptic target.
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AP trigger Ca ions --> mobilize synaptic vesicles Ach floods synaptic cleft and locks into recptors post- synaptic membrane (another dendrite or muscle).
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What is the role of neuroglia with respect to nerve function?
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Scaffolding for the nerves
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6 neuroglia
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1. Astrocytes - Like connective tissue and scavenging activities
2. Oligodendrecites - forms myelin stealth 3. Ependymal cells- creates CSF provides blood-brain barrier 4. Microglia - macrophage 5. Satellite Cells - surround the Soma 6. Schwann Cells - myelin sheath in PNS |
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What structural characteristic enhances nerve impulse transmission?
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Myelin sheathing and Nodes of Ranvier
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Explain the essential aspects of a graphic depiction of a nerve impulse.
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Resting state, depolarization, repolarization, hyperpolarization
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Name and describe the three basic nerve types. Include key functional criteria for each type.
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1 -Unipolar - sensory,
2-Bipolar - ear, eye, nose, least common, no myelin, 3-multipolar - most common, Create the neural network in the brain and the kind that controls muscle activity |
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bipolar nerve types
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ear, nose, eye, least common no mylin
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unipoloar
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sensory
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multipolar
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most common,
Creates a nueral network in the brain and the kind that controls muscle movement |
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Action Potential
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Electrical
a large transient depolarization event, including polarity reversal, that is conducted along the membrane of a muscle cell or a nerve fiber |
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Astrocytes
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like connective tissue and scavenging activites
most abundant |
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Oligodendrecites
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Forms myelin sheath
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Ependymal cells
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creates CSF provides blood-brain barrier
ke the cutaneous membrane of the CNS |
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Satallite Cells
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surround the soma
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Astrocytes
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like connective tissue and scavenging activites;
most abundant |
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Schwann Cells
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mylin sheath in PNS
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Oligodendrecites
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Forms myelin sheath
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Ependymal cells
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creates CSF provides blood-brain barrier
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Satallite Cells
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surround the soma
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Schwann Cells
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mylin sheath in PNS
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