01 CNS Cells
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![](https://photos.thisispiggy.com/file/wikiFiles/AC7F0B3F-199C-4B56-B4ED-CEF10768192C.jpg)
![](https://photos.thisispiggy.com/file/wikiFiles/272FE1F3-124B-447A-9D90-162F2E095DF7.jpg)
Gial Cells
![](https://photos.thisispiggy.com/file/wikiFiles/2F8DFCCF-3F1D-4740-B515-C74E701E133C.jpg)
Neurons
![](https://photos.thisispiggy.com/file/wikiFiles/BCD35B12-D121-4D95-B4B7-A0C106DBD87E.jpg)
AP
![](https://photos.thisispiggy.com/file/wikiFiles/02B2957A-6520-43A3-B0FF-5A01537F1EE3.jpg)
- at rest: high Na concentration outside cell, K leak out constantly maintain -70
- depolarize: Na open, raise voltage. More channels open down the axon
- At end of cell, Ca channels open, NT released
![](https://photos.thisispiggy.com/file/wikiFiles/FBE23385-D5E6-4B4B-BEE1-194929B12CF5.jpg)
- depolarization: Na in
- repolarization: K out
![](https://photos.thisispiggy.com/file/wikiFiles/D474836A-8D46-4984-B0F5-0D9097B6A65F.jpg)
Astrocytes
![](https://photos.thisispiggy.com/file/wikiFiles/D6AE1DCE-81E5-4FDB-9EE9-15A589A242A3.jpg)
- repair, scar, clean up NT
![](https://photos.thisispiggy.com/file/wikiFiles/184902C2-0D64-4909-97A9-349212E7E65C.jpg)
Microglia
![](https://photos.thisispiggy.com/file/wikiFiles/E1D21F29-754D-483E-9815-E623995850C4.jpg)
Oligodendroglia
![](https://photos.thisispiggy.com/file/wikiFiles/9A919BDD-D5AF-4CA5-87A4-F91459670CDC.jpg)
Schwann
![](https://photos.thisispiggy.com/file/wikiFiles/0C5024A2-D1D2-4840-9BF8-BE14F82799C8.jpg)
Myelin
![](https://photos.thisispiggy.com/file/wikiFiles/9C84A03E-9C6F-4C0D-BB67-A2397B332130.jpg)
- conduction velocity: speed at which electricity go down
- length constant: how far go down neuron until 1/3 left of original strength
Nerve Fibers
![](https://photos.thisispiggy.com/file/wikiFiles/19B1E458-2261-411B-9BD9-6A0DD22FA04D.jpg)
- small fibers easier blocked by Na blockers (no pain but still touch)
Sensory Nerves
![](https://photos.thisispiggy.com/file/wikiFiles/50E83630-AD52-43C2-8CE3-3145F163489B.jpg)
Free Nerve
![](https://photos.thisispiggy.com/file/wikiFiles/5742DB95-9CD3-4182-BA5B-42563C903C0F.jpg)
Meissner
![](https://photos.thisispiggy.com/file/wikiFiles/510A024A-3676-4B26-924F-F04924CF397C.jpg)
Pacinian
![](https://photos.thisispiggy.com/file/wikiFiles/550F813E-FD80-48F1-900A-C5A6C0AA4A3E.jpg)
Merkel
![](https://photos.thisispiggy.com/file/wikiFiles/AA20EA80-918A-4196-A1D8-2087AD7E0E8E.jpg)
Peripheral Nerves
![](https://photos.thisispiggy.com/file/wikiFiles/DBAACDA8-6EF8-497D-8C50-0F9A6F7E1738.jpg)
- Nerve trunk
- fasciculus: made up of small nerves
- endoneurium inflammed in GBS
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