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| Neuropil is the feltwork of unmyelinated neuronal processes
(axonal and dendritic) within the gray matter of the central
nervous system. Traditionally, when pathologists looked at brain
tissue they concentrated on neurons (the active functioning
cells of the brain), glial cells and axons (especially in white
matter, which is mostly composed of axons and glia cells).
Neurons are the cells that perform the actual processing of
information. Glia cells have 'supporting' functions in a very
loose sense of the word. Also, most brain tumors arise from
glial cells. On a coarse scale nervous tissue (ignoring blood
vessels etc.) is composed of the cell body of the neurons and
glia cells and their processes or protrusions. For neurons,
these are dendrites, dendritic spines and axons. Dendrites
collect input from other neurons, which is processed by the
neuron (in dendrite and cell body) and propa