Ependymoglia Cells

The introduction of the term "ependyma" was meant to describe the cell layer lining the ventricles of the brain. However, a recent definition or classification of ependymoglial cells has been under debate. Some argue that certain members should be classified as astrocytes, whereas others argue that ependymoglial cells are distinct since they have many characteristics not shared by typical astrocytes. An ependymoglial cell is usually defined as a glial cell extending at least one of its processes to the ventricular space and having physical contact with the outer surface of neural tissue. Ependymoglia are made up of different members, including fetal radial glia, tanycytes, and Muller cells. Other cell types, such as Bergmann glia, have radial processes that extend to the ventricles of the brain.

However, since they do not actually establish contact with the apical surface of neural tissue, they are considered to be astrocytes and not ependymoglia.

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