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Glial Cells

Glial Cells

Nervous Tissue: Glial Cells

Nervous Tissue: Glial Cells

Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial...

Neurogenesis and Regeneration of Nervous Tissue

Neurogenesis and Regeneration of Nervous Tissue

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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Related Experiment Video

Updated: Aug 15, 2025

Dissection and Isolation of Murine Glia from Multiple Central Nervous System Regions

Dissection and Isolation of Murine Glia from Multiple Central Nervous System Regions

Published on: June 4, 2020

Evolutionarily conserved concepts in glial cell biology.

¹Department of Biological Sciences, IN, USA; The Center for Stem Cells and Regenerative Medicine, University of Notre Dame, Notre Dame, IN, USA.

Current Opinion in Neurobiology

|December 28, 2022

Summary

Glial cells, crucial for nervous system function, show evolutionary conservation. Non-mammalian models have significantly advanced our understanding of mammalian glial cell biology and opened new research questions.

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Area of Science:

Neuroscience
Cell Biology
Evolutionary Biology

Background:

Glial cells, historically viewed as mere support cells, are now recognized for their essential roles throughout the lifespan of most nervous systems.
The study of glial cell biology has experienced exponential growth in the past decade.
Advances in understanding glial cells in mammalian nervous systems have been significantly informed by research in non-mammalian model organisms.

Purpose of the Study:

To review the evolutionary conservation of glial cells.
To highlight seminal findings in glial biology derived from non-mammalian model systems.
To discuss recent discoveries and future research directions in glial cell biology.

Main Methods:

Review of historical and recent scientific literature on glial cell biology.
Emphasis on studies utilizing non-mammalian model systems (e.g., invertebrates, lower vertebrates).
Synthesis of findings to illustrate the contribution of comparative approaches to neuroscience.

Main Results:

Glial cells exhibit remarkable evolutionary conservation across diverse species.
Non-mammalian models have provided critical insights into fundamental glial functions, including development, homeostasis, and repair.
Comparative studies have illuminated conserved molecular mechanisms and cellular processes in glia.
Recent findings reveal novel glial functions and interactions, prompting new avenues of investigation.

Conclusions:

Non-mammalian model systems are invaluable tools for deciphering complex glial cell biology.
Understanding conserved glial mechanisms is key to advancing knowledge of the mammalian nervous system.
The field of glial biology continues to evolve, with ongoing research promising further breakthroughs.