Neuron-glia interaction in the insect nervous system.

In all complex organisms, glial cells are pivotal for neuronal development and function. Insects are characterized by having only a small number of these cells, which nevertheless display a remarkable molecular diversity. An intricate relationship between neurons and glia is initially required for glial migration and during axonal patterning. Recent data suggest that in organisms such as Drosophila , a prime role of glial cells lies in setting boundaries to guide and constrain axonal growth.