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The ependyma is made up of ependymal cells called ependymocytes, a type of glial cell. These cells line the ventricles in the brain and the central canal of the spinal cord, which become filled with cerebrospinal fluid. These are nervous tissue cells with simple columnar shape, much like that of some mucosal epithelial cells. [2]
Pituicytes from the posterior pituitary are glial cells with characteristics in common to astrocytes. [24] Tanycytes in the median eminence of the hypothalamus are a type of ependymal cell that descend from radial glia and line the base of the third ventricle. [25]
This schematic illustrates the four different types of glial cells, all of which possess cytoplasmic processes: ependymal cells (light pink), astrocytes (green), microglia (red), and oligodendrocytes (light blue). Cell bodies of neurons are in yellow (Their axons are surrounded by myelin, produced by oligodendrocytes).
Glial fibrillary acidic protein (GFAP) is a protein that is encoded by the GFAP gene in humans. [5] It is a type III intermediate filament (IF) protein that is expressed by numerous cell types of the central nervous system (CNS), including astrocytes [6] and ependymal cells during development. [7]
The subependymal zone (SEZ) is a cell layer below the ependyma in the lateral ventricles of the brain. It is an adult version of the embryonic forebrain germinal zone.This region contains adult neural stem cells also called neuroepithelial cells which have the potential to generate new neurons and glial cells. [1]
Nervous tissue is composed of neurons, also called nerve cells, and neuroglial cells. Four types of neuroglia found in the CNS are astrocytes, microglial cells, ependymal cells, and oligodendrocytes. Two types of neuroglia found in the PNS are satellite glial cells and Schwann cells.
The lightly stained columns projecting toward the center are the apical extensions of the ependymal cells. The posterior commissure is at the top of the photo, and the space below the SCO is part of the third ventricle, which is lined with ependymal cells. Cell nuclei are stained blue. The scale bar = 50 microns (0.05 mm).
Glial cells were determined to communicate with one another solely with chemical signals and even had specialized glial-glial and neuron-glial neurotransmitter signaling systems. Additionally, neurons were found to release chemical messengers in extrasynaptic regions, suggesting that the neuron-glial relationship includes functions beyond ...