________ attacks oligodendrocytes and kills portions of myelin sheathing in the CNS- causes neurons to slow down /not perform properly.
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Tumors
________- almost always driven by glial cells (glioma), astrocytes in particular are the worst (astrocytoma)
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control blood flow
Astrocytes- ________ using their end feet on capillaries;"huggies "around synapses; help for the outer layer of the BBB; thousand of processes from a single cell body.
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Neural Plasticity
________- happens at the level of the synapse- mods made to catch more /less NTs in the synaptic cleft.
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Interneurons
________- covers actions b /w motor and sensory.
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Axon
________ collateral- branching of the ________ towards the end, leads to the ________ terminal /terminal endings /terminal end bulbs (the neurotransmitter is packaged in the terminal bulbs)
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Oligodendrocytes
________- specialized cells in the brain /spinal cord (CNS) that form myelin sheaths around axons (this is their only job)
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Microglial cells
________- housekeepers, chomp up debris in brain that shouldnt be there → if they chomp too much, there is inflammation and swelling (edema)
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Axon hillock
________- signals are computed (like doing math); if the signal is positive enough, the AH will send it along to fire.
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Sensory neurons
________- receive info from enviro, like touch cells- external source and coding.
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Axon
________- transmits info thru the conduction zone; can be coated in myelin sheaths (made by glial cells)
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Structure known thanks to Ramon y Cajal (1852
1934) using a camera affixed to a microscope
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The Neuron Doctrine
neurons are structurally, metabolically, and functionally independent; info is transmitted from neuron to neuron across a synapse
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Dendrites
branches
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Soma (cell body)
contains info
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Nucleus
inside the cell body
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Axon hillock
signals are computed (like doing math); if the signal is positive enough, the AH will send it along to fire
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Axon
transmits info thru the conduction zone; can be coated in myelin sheaths (made by glial cells)
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Nodes of ranvier
gaps b/w each myelin sheath
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Axon collateral
branching of the axon towards the end, leads to the axon terminal/terminal endings/terminal end bulbs (the neurotransmitter is packaged in the terminal bulbs)
specialized cells in the brain/spinal cord (CNS) that form myelin sheaths around axons (this is their only job)
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Schwann cells
individual cells building myelin for motor neurons; each individual cell has its own nucleus; only in the PNS
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MS attacks oligodendrocytes and kills portions of myelin sheathing in the CNS
causes neurons to slow down/not perform properly
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Astrocytes
control blood flow using their end feet on capillaries; "huggies" around synapses; help for the outer layer of the BBB; thousand of processes from a single cell body
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Radial glial cells
only during prenatal development, help cell migration
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Tumors
almost always driven by glial cells (glioma), astrocytes in particular are the worst (astrocytoma)
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Microglial cells
housekeepers, chomp up debris in brain that shouldnt be there → if they chomp too much, there is inflammation and swelling (edema)