Glial cells: Difference between revisions
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[[image: | [[image:headonfire.jpg|right|thumb|300px|This man's head is on fire, due to failure of the glial cells to maintain a health neuronal operating environment.]] | ||
===What are they?=== | ===What are they?=== | ||
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===What types are there?=== | ===What types are there?=== | ||
There are many types, the key ones being: | There are many types, the key ones being: | ||
*'''Astrocytes''' - starfish-shaped cells which have long processes which wrap around capillaries in the brain to form the blood brain barrier | *'''Astrocytes''' - starfish-shaped cells which have long processes which wrap around capillaries in the brain to form the [[blood brain barrier]] | ||
*'''Oligodendrocytes''' - the myelinating cells in the CNS which wrap around 3-50 adjacent axons, insulating them from each other and allowing higher speeds of [[action potential]] conduction | *'''Oligodendrocytes''' - the myelinating cells in the [[CNS]] which wrap around 3-50 adjacent axons, insulating them from each other and allowing higher speeds of [[action potential]] conduction | ||
*'''Ependymal cells''' - form the lining of the ventricles. In the lateral ventricles they form the choroid plexus which produces [[CSF]]. | *'''Ependymal cells''' - form the lining of the [[ventricles]]. In the lateral ventricles they form the choroid plexus which produces [[CSF]]. | ||
*'''Microglia''' - the [[macrophages]] of the brain | *'''Microglia''' - the [[macrophages]] of the brain | ||
*'''Schwann cells''' - the myelinating cells in the PNS which wrap around one axons, insulating it and allowing higher speeds of [[action potential]] conduction | *'''Schwann cells''' - the myelinating cells in the PNS which wrap around one axons, insulating it and allowing higher speeds of [[action potential]] conduction | ||
Latest revision as of 18:13, 19 March 2011
What are they?
Glial cells make up 90% of the nervous system, creating and maintaining an environment for the neurones to function.
What types are there?
There are many types, the key ones being:
- Astrocytes - starfish-shaped cells which have long processes which wrap around capillaries in the brain to form the blood brain barrier
- Oligodendrocytes - the myelinating cells in the CNS which wrap around 3-50 adjacent axons, insulating them from each other and allowing higher speeds of action potential conduction
- Ependymal cells - form the lining of the ventricles. In the lateral ventricles they form the choroid plexus which produces CSF.
- Microglia - the macrophages of the brain
- Schwann cells - the myelinating cells in the PNS which wrap around one axons, insulating it and allowing higher speeds of action potential conduction