What is neuroglia?

The non-neuronal cells of the nervous system. They
not only provide physical support, but also
respond to injury, regulate the ionic and chemical
composition of the extracellular milieu,
participate in the blood-brain barrier and
blood-retinal barrier, form the myelin insulation
of nervous pathways, guide neuronal migration
during development, and exchange metabolites with
neurons. Neuroglia have high-affinity transmitter
uptake systems, voltage-dependent and
transmitter-gated ion channels, and can release
transmitters, but their role in signaling (as in
many other functions) is unclear.

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