Talk in general about astrocytes

These are the most numerous glial cells, they are large star-shaped cells, with a cell body and numerous cytoplasmic processes that vary from one cell to another (number, shape, aspect, ramifications). The processes in contact with blood vessels are called vascular feet. The cytoplasm contains the nucleus as well as the usual organelles of the cell, but it is essentially characterized by an abundance of specific gliofilaments (GF). Astrocytes form a relatively impermeable barrier at the periphery and on the surface of the CNS, close to the innermost meninge. There they are covered by a basal lamina and they are called marginal astrocytic covering (or limiting glial lamina).