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Glial cells
1Department of Anatomy and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK. k.jessen@ucl.ac.uk
The International Journal of Biochemistry & Cell Biology
|June 19, 2004
Summary
Glial cells, outnumbering neurons, are crucial for nervous system development, function, and synapse regulation. These cells form myelin, maintain neuronal environments, and guide nervous system formation.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- The nervous system comprises neurons and glial cells, with glia being more numerous and occupying significant tissue space.
- Key glial cell types include astrocytes and oligodendrocytes (CNS), and Schwann cells, enteric glial cells, and satellite cells (PNS).
Purpose of the Study:
- To summarize the multifaceted roles of glial cells in the nervous system.
- To highlight glial contributions from embryonic development to adult synaptic function.
Main Methods:
- Review of existing literature on glial cell biology and function.
- Synthesis of data on glial cell types, distribution, and roles.
Main Results:
- Glial cells are essential for embryonic nervous system development, regulating neuronal survival and differentiation.
- In adults, glia form myelin sheaths for rapid signal conduction and maintain the ionic and neurotransmitter balance of the neuronal environment.
- Emerging evidence underscores glia's critical role in regulating synapse formation, maintenance, and function.
Conclusions:
- Glial cells are indispensable components of the nervous system, performing vital functions beyond myelination.
- Their roles extend to developmental scaffolding, environmental homeostasis, and synaptic plasticity, highlighting their importance in overall nervous system health and function.