Their processes envelop all retinal neurons except at their synapses. Astrocytes are brain derived support cells and are generally found only as far as the optic nerve and in the nerve fiber layer of the retina. Their peak numbers are at the optic nerve head. They are not found in the fovea or ora serrata. Because their processes envelope blood vessels of the optic nerve and nerve fiber layer they probably act as a blood brain barrier.
Microglia are of mesodermal origin rather than being true neuroglia.
They probably developed with blood vessels. They are in every retinal layer. Oligodendrocytes form myelin sheaths around optic nerve axons. An optical device used to view the iridocorneal angle . The information contained on this website should not be considered medical guidance or professional advice.