On the other hand, Schwann cells are the myelinating cells in the peripheral nervous system (PNS). Schwann cell, any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons. Furthermore, Schwann cells – but not oligodendrocytes – are surrounded by a basal lamina that is continuous with the adjacent internode. 1986. Each oligodendrocyte is able to myelinate several nearby neurons. Myelin acts as an insulator of axonal segments and is a prerequisite for the high velocity of nerve conduction, of up to 200 m/second. The type of axon determines whether loose or tight myelination is needed. J Neurocytol. Black JA, et al. Not only did Hortega offer the first detailed morphological description of these cells, he also implied their role in myelination. 1986 Dec;15(6):745-61. doi: 10.1007/BF01625192. Oligodendrocytes are the cells of the central nervous system that are responsible for forming the myelin sheath of nerve fibers. Schwann cells are the oligodendrocyte counterpart in the peripheral nervous system (PNS), derived from the neural crest .
Difference Between Schwann Cell and Oligodendrocyte Definition. Key Difference – Oligodendrocytes vs Schwann Cells Neuroglia or glial cells are nonneuronal cells which support the function of central and peripheral nervous systems.These cells protect neurons and prevent the loss of signals during the transmission through neurons.Glial cells surround neurons and form insulating layers around the axons.There are different types of glial cells. Other Myelin-Producing Cells.

Interfascicular oligodendrocytes are aligned in rows between the nerve fibres of the white matter of the central nervous system. The protein product of the neurofibromatosis type 1 gene is expressed at highest abundance in neurons, Schwann cells, and oligodendrocytes. First, Schwann cells myelinate neurons in the peripheral nervous system, whereas oligodendrocytes myelinate neurons in the central nervous system. However, oligodendrocytes have multiple cytoplasmic processes and myelinate several (up to 50) axons at the same time. Black JA, Waxman SG, Sims TJ, Gilmore SA. Schwann cells or neurolemmocytes (named after German physiologist Theodor Schwann) are the principal glia of the peripheral nervous system (PNS). In addition, nodes of Ranvier in the PNS are covered by Schwann cell processes, while axons at CNS nodes are bare.

There are four types of neuroglial cells in the central nervous system These are Astrocytes, Oligodendrocytes, Microglia, and Ependyma. Once an appropriate axon is identified, the oligodendrocyte cell membrane expands to ensheath the cell body in layers of fatty membrane. Balanced expression of several genes and activation of transcription factors critically regulate the entire complicated functional network of astrocytes, oligodendrocytes and Schwann cells.

In gray matter, perineuronal oligodendrocytes are located in close proximity to the somata of neurons. Learn more about Schwann cell sin this article. Oligodendrocytes (from Greek, meaning ‘cells with a few branches’), or oligodendroglia, are a type of neuroglia whose main functions are to provide support and insulation to axons in the central nervous system of some vertebrates, equivalent to the function performed by Schwann cells in the peripheral nervous system. In addition, the oligodendrocytes stand out due to prolongations. Both Schwann cells and oligodendrocytes facilitate the signal transduction through the axons. Effects of delayed myelination by oligodendrocytes and Schwann cells on the macromolecular structure of axonal membrane in rat spinal cord. Hortega characterized oligodendrocytes in the 1920s using silver carbonate impregnation techniques. The association of … Schwann Cells and Oligodendrocytes perform essentially the same function (mylenation of axons). In tight myelination an oligodendrocyte wraps itself like a rolled sheet around a length of axon until the fibre is covered by several layers. These cells are equivalent to a type of neuroglia called oligodendrocytes, which occur in the central nervous system. In the peripheral nervous system, neuroglia that are equivalent to oligodendrocytes are called Schwann cells. Oligodendrocytes are the cells in the CNS that manufacture and maintain myelin, and as such they play an analogous role to the Schwann cells in the PNS. There are, however, several crucial differences between Schwann cells and oligodendrocytes. Thanks to the process of formation and maintenance of the myelin sheath, the axons of the central nervous system have an insulation coating that increases their speed of nerve conduction. Daston MM(1), Scrable H, Nordlund M, Sturbaum AK, Nissen LM, Ratner N. Author information: (1)Department of Anatomy and Cell Biology, University of Cincinnati College of Medicine, Ohio 45267-0521. Oligodendrocytes and Schwann cells share main functions in providing support and insulation for axons. Oligodendrocytes thus function much like Schwann cells do in the PNS.
The major difference between them is their location.


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