Two main types of astrocytes are found in the SGZ: radial astrocytes and horizontal astrocytes. Radial astrocytes are synonymous with the radial glia cells described earlier and play dual roles as both glial cells and neural stem cells. It is not clear whether individual radial astrocytes can play both roles or only certain radial astrocytes can give rise to NSCs.
There exist two main types of astrocytes in the SGZ: radial and horizontal astrocytes. Radial astrocytes are identical to the radial glia cells previously mentioned and serve as both support cells for neurons and stem cells responsible for generating new neural tissue. The exact nature of their role remains uncertain, whether they can simultaneously perform these functions or only specific ones give rise to NSCs.