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Neuron Structure01:30

Neuron Structure

Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
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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.
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Related Experiment Video

Updated: Jun 17, 2026

Visualizing Astrocyte Morphology Using Lucifer Yellow Iontophoresis
07:38

Visualizing Astrocyte Morphology Using Lucifer Yellow Iontophoresis

Published on: September 14, 2019

Heterogeneity in astrocyte morphology and physiology.

Vitali Matyash1, Helmut Kettenmann

  • 1Cellular Neurosciences, Max Delbrück Center for Molecular Medicine (MDC), 13092 Berlin, Germany.

Brain Research Reviews
|December 17, 2009
PubMed
Summary

Astrocyte heterogeneity is significant, with diverse morphological and functional variants across brain regions and developmental stages. Further research is needed to fully understand these differences in normal brain function.

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Last Updated: Jun 17, 2026

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Published on: September 14, 2019

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Astrocytes are glial cells crucial for brain function.
  • The astrocyte population is not well-defined and exhibits significant variability.

Purpose of the Study:

  • To highlight the heterogeneity of astrocytes.
  • To emphasize the need for further research into astrocyte diversity.

Main Methods:

  • Review of existing literature on astrocyte morphology and function.
  • Comparative analysis of human and rodent astrocytes.
  • Examination of functional differences based on brain region and development.

Main Results:

  • Identified at least 9 morphological variants of astrocytes.
  • Observed greater morphological complexity in human astrocytes compared to rodents.
  • Documented functional differences in gap junctional coupling, receptor expression, membrane currents, and glutamate transporters.

Conclusions:

  • Astrocyte heterogeneity is a complex and underexplored area.
  • Significant morphological and functional diversity exists within the astrocyte population.
  • This study serves as a foundation for future research into astrocyte biology.