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22 Cards in this Set
- Front
- Back
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Interneurons (where, what, and how)
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-in CNS
-multipolar -takes info to CNS and brings back a synapse to interneurons |
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Ganglion (what)
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collection of nerve cell bodies outside the CNS
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Nucleus (what)
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collection of nerve cell bodies inside the CNS
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synapse (what)
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connections b/t neurons
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presynaptic (what)
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neuron before a synapse
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postsynaptic (what)
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neuron after a synapse
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electrical synapse (where and how)
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-found in cardiac muscle
-ions pass through gap junctions |
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chemical synapse (how)
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-neurological info transmitts from neuron to neuron or neuron to mucle using neuro transmitters
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How does a neuron function at rest?
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-neurons at rest are polarized
-net positive charge outside membrane and net negative charge in cytoplasm |
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How does a neuron function during a stimulus?
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-stimulus makes neurons permiable to sodium ions and they enter the neuron
-depolarized |
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How does a neuron function when a stimulus ends?
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-When impulse leaves a particular neuron, Na+ gets escorted back outside the membrane
-repolarized |
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Glial cells (where and what)
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-in CNS and PNS
-protect and nurture other cells |
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What are the 6 types of glial cells?
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1. Neurolemmocytes
2.Oligodendrocyte 3.satellite cells 4.ependymal cells 5.astrocytes 6.microglia |
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Neurolemmocytes (what and where)
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-Schwann cells
-makes myelin sheath -in PNS |
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Oligodendrocyte (what and where)
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-makes myelin sheath
-supplies myelin for several adjacent neurons -in CNS |
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What is the true function of myelin sheath? Why broken up in blocks?
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-to make sure impulses go where you want it to go
-to increase the speed of impulse |
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Satellite cells (where, what)
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-in posterior root ganglion
-outside CNS -surround nerve cell bodies -maintain and repair nerve cells |
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Ependymal cells (what and where)
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-synthesize and circulate cerebrospinal fluid (CSF)
-ciliated, helps circulate CSF -along the edge central canal of spinal cord |
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Cerebrospinal fluid (what,how,where)
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-cushons and protects brain
-collects metabolic wastes -suppliments blood supply -provides nutrients -in and around brain and spinal cord |
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Astrocytes (what)
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-create and maintain the blood-brain barrier (BBB)
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Blood-brain barrier (what, how)
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-keeps metabolic wastes out of CNS
-keeps some medicinal molecules out of brain -surrounds capillaries in CNS (simple squamous cells-not perforated) |
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Microglia (what, how)
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-macrophage
-"trash cans" of the CNS -keeps CNS clean -phagocytize metabolic wastes |
