Neuropil, sometimes referred to as "neuropile," is a broad term defined as any area in the
nervous system composed of mostly
unmyelinated axons,
dendrites and
glial cell processes that forms a synaptically dense region containing a relatively low number of cell bodies. The most prevalent anatomical region of neuropil is the
brain which, although not completely composed of neuropil, does have the largest and highest synaptically-concentrated areas of neuropil in the body. For example, the
neocortex and
olfactory bulb both contain neuropil.