Fibrous astrocytes are primarily found in the white matter.

Fibrous astrocytes are primarily found in the white matter.

• A. They are found in the white matter
• B. They are found in the gray matter
• C. They myelinate axons
• D. They produce CSF

Answer: (A)

Fibrous astrocytes are the glial cells with long, slender processes that run alongside white-matter tracts. This morphology and location fit the white matter, where most axons are myelinated and organized into bundles; these astrocytes help support the axons, help regulate the extracellular environment, and interact with blood vessels in that region. In gray matter, astrocytes are typically protoplasmic, with many short, branched processes that surround neurons and synapses. So fibrous astrocytes are primarily found in white matter. They do not myelinate axons (that’s done by oligodendrocytes) and they do not produce CSF (that's produced by the choroid plexus epithelium/ependymal cells).

Fibrous astrocytes are the glial cells with long, slender processes that run alongside white-matter tracts. This morphology and location fit the white matter, where most axons are myelinated and organized into bundles; these astrocytes help support the axons, help regulate the extracellular environment, and interact with blood vessels in that region. In gray matter, astrocytes are typically protoplasmic, with many short, branched processes that surround neurons and synapses. So fibrous astrocytes are primarily found in white matter.

They do not myelinate axons (that’s done by oligodendrocytes) and they do not produce CSF (that's produced by the choroid plexus epithelium/ependymal cells).