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Glia cells

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Main characteristics of glial cells

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  • Ability to Divide: Unlike mature neurons, glial cells can divide and multiply. This enables them to repair damaged tissue and respond to changes in the nervous system. In contrast, mature nerve cells are generally unable to divide and cannot regenerate.

  • Uniform Cell Extensions: Glial cells have cell extensions that are not divided into specialized structures like axons or dendrites. They have a uniform morphology.

  • No Synapses: Glial cells do not form synapses like neurons. They communicate with each other and with neurons in other ways.

  • Size: Glial cells are generally smaller than neurons.

  • Variety of Functions: Glial cells have a wide range of functions essential for the smooth functioning of the nervous system. These include supporting neurons, myelinating axons, immune defense, regulating the extracellular environment, supplying nutrients, and removing waste products.

There are different types of glial cells, each with specific tasks:

  • Oligodendrocytes (CNS): Form the myelin sheaths around axons in the brain and spinal cord.
  • Schwann Cells (PNS): Form the myelin sheaths around axons in the peripheral nervous system. They are also involved in nerve fiber regeneration.
  • Astrocytes (CNS): Provide nutrients to neurons, regulate the extracellular environment, remove neurotransmitters, and play a role in signal processing.
  • Microglia (CNS): Perform immune functions, remove damaged cells and waste products in the central nervous system.
  • Ependymal Cells: Line the brain ventricles and the central canal of the spinal cord, producing cerebrospinal fluid (CSF), which flows through the brain ventricles and the central canal of the spinal cord.

In summary, glial cells are characterized by their ability to divide, uniform cell extensions, non-synaptic nature, and smaller size compared to neurons. They have important supportive and regulatory functions in the nervous system. The term “uniform cell extensions” means that glial cells do not have specialized extensions like axons or dendrites, but rather possess more uniform extensions.

see also

Tags: neurobiology science
Superlink: 051 ☣Neurobiology 050 🧠Neuroscience

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Created: 11-02-25 14:35