style="font-size: larger;" | Oligodendrocyte

General Information
Tissue type	Nervous
Cell type	Neuroglia
Location	Central nervous system
Role	Myelination
Identification	Robertson, 1899
Ultrastructure
Soma size	10–20μm
Unique organelles	None
Unique feature	Myelinating processes

Oligodendrocytes (from Greek literally meaning few tree cells), or oligodendroglia (Greek, few tree glue),. are a variety of neuroglia. Their main function is the myelination of nerve cells exclusively in the central nervous system of the higher vertebrates, a function performed by Schwann cells in the peripheral nervous system. A single oligodendrocyte can extend to up to 50 axons, wrapping around approximately 1 mm of each and forming the myelin sheath. Oligodendrocytes, as well as other macroglial cells (astrocytes and ependymal cells), are derived from neuroectoderm.

Function

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The nervous system of mammals depends crucially on this sheath for insulation as it results in decreased ion leakage and lower capacitance of the cell membrane. There is also an overall increase in impulse speed as saltatory propagation of action potentials occurs at the nodes of Ranvier in between Schwann cells (of the PNS) and oligodendrocytes (of the CNS); furthermore miniaturization occurs, whereby impulse speed of myelinated axons increases linearly with the axon diameter, whereas the impulse speed of unmyelinated cells increases only with the square root of the diameter.

As part of the nervous system they are very closely related to nerve cells and like all other glial cells the oligodendrocytes have a supporting role towards neurons and are intimately involved in signal propagation, providing the same functionality as the insulation on a household electrical wire.

Pathology

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Diseases that result in injury to the oligodendroglial cells include demyelinating diseases such as multiple sclerosis and leukodystrophies. Oligodendroglia are also susceptible to infection by the JC virus, which causes progressive multifocal leukoencephalopathy (PML), a condition which specifically affects white matter, typically in immunocompromised patients. Tumors of oligodendroglia are called oligodendrogliomas.

Notes

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References

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Glial cells

Oligodendrozyt | Oligodendrocyte | Oligodendrociet | Олигодендроциты