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Related Concept Videos

Nervous Tissue: Myelin01:25

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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A typical nerve cell comprises three main components: the cell body, dendrites, and the axon. The cell body, also known as the soma or perikaryon, serves as the central biosynthetic hub housing a nucleus surrounded by cytoplasm containing organelles commonly found in most cells. Notably, Nissl bodies, clusters of the rough endoplasmic reticulum and free ribosomes responsible for protein synthesis, are distinctive features of the neuronal cell body. As neurons age, aggregates of a brown pigment...
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Oligodendrocytes: Myelination and Axonal Support.

Mikael Simons1, Klaus-Armin Nave2

  • 1Cellular Neuroscience, Max Planck Institute of Experimental Medicine, 37075 Göttingen, Germany Department of Neurology, University of Göttingen, 37075 Göttingen, Germany.

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Myelin sheaths, formed by oligodendrocytes, insulate nerve fibers for rapid signal transmission. These cells actively support axon health, going beyond simple insulation.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Myelinated nerve fibers are crucial for fast signal transduction in the nervous system.
  • The myelin sheath, formed by oligodendrocytes, acts as an electrical insulator around axons.
  • Recent findings suggest myelin is not merely an inert structure but involves active cellular processes.

Purpose of the Study:

  • To review the generation of myelin.
  • To explore the role of oligodendrocytes in maintaining myelinated axon integrity.
  • To highlight the dynamic nature of the myelin sheath.

Main Methods:

  • Literature review of current evidence on myelin formation and function.
  • Analysis of oligodendrocyte-axon interactions.
  • Synthesis of data on macromolecule transport within myelinic channels.

Main Results:

  • Myelin sheath formation involves spiral wrapping and compaction of the oligodendrocyte plasma membrane.
  • Oligodendrocytes are metabolically active and communicate with axons.
  • Myelinic channels facilitate the movement of macromolecules, supporting axonal health.

Conclusions:

  • Myelin serves a vital role in efficient neural signaling.
  • Oligodendrocytes actively support the long-term integrity of myelinated axons.
  • The myelin sheath is a dynamic structure with active cellular functions.