How do radial glial cells contribute to cortical development?

How do radial glial cells contribute to cortical development?

• A. They act as neural progenitors and provide a scaffold for migrating neurons to reach the cortex.
• B. They form myelin around axons.
• C. They become microglia in the cortex.
• D. They secrete cerebrospinal fluid into ventricles.

Answer: (A)

Radial glial cells are essential players in cortical development because they perform two intertwined tasks. They act as neural progenitors, generating neurons that will populate the cerebral cortex, and they provide a scaffold with long processes that span from the ventricle to the outer surface of the cortex. Newly formed neurons migrate along these glial fibers from the ventricular zone outward toward their final positions in the cortical plate, producing the characteristic inside-out layering of the cortex. After neurogenesis, radial glia can differentiate into glial cells such as astrocytes, but during the crucial period of cortical formation their main roles are to generate neurons and to guide their migration. Other functions described by other options—myelination, microglial origin, and CSF secretion—are performed by other cell types (oligodendrocytes, microglia, and ependymal cells, respectively).

Radial glial cells are essential players in cortical development because they perform two intertwined tasks. They act as neural progenitors, generating neurons that will populate the cerebral cortex, and they provide a scaffold with long processes that span from the ventricle to the outer surface of the cortex. Newly formed neurons migrate along these glial fibers from the ventricular zone outward toward their final positions in the cortical plate, producing the characteristic inside-out layering of the cortex. After neurogenesis, radial glia can differentiate into glial cells such as astrocytes, but during the crucial period of cortical formation their main roles are to generate neurons and to guide their migration. Other functions described by other options—myelination, microglial origin, and CSF secretion—are performed by other cell types (oligodendrocytes, microglia, and ependymal cells, respectively).