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Nervous tissue consisting of a fibrous network of nonmyelinated nerve fibers; gray matter with few nerve cell bodies; usually a region of synapses between axons and dendrites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(1) An obsolete term designating a fibrous nerve tissue structure that is found predominantly in invertebrates. The supposedly interconnected nerve fibers form a continuous cytoplasmic network that resembles a syncytium. This use of the term “neuropil” does not accurately reflect the microstructure of the nervous system. (See.)

(2) The fibrous nerve tissue structure in which synaptic contacts between neuronal outgrowths are concentrated.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Numerous asymmetric and symmetric chemical synapses, corresponding to the excitatory and inhibitory synapses, respectively, were seen in the neuropile region.
Low-voltage electrical stimulation of the oral ganglion on the lower lip of the larval mouth or the apical neuropile between the preoral and anterolateral arms on the preoral hood region of the D.
The apical ganglion continues to grow as larvae approach competency, with the addition of immunoreactive neurons and an associated increase in complexity in the neuropile and ciliary nerves surrounding the area.
In most decapods with stalked eyes, the optic neuropiles are located within the eyestalks in optic lobes that form the most anterior parts of the brain.
Within the ganglion, these afferent projections and processes of intrinsic FMRFa-ir neurons form a dense FMRFa-ir neuropile.
These modifications strikingly correlate with the acquisition rate and with the duration of retention, indicating that information during learning is in part processed within optic neuropiles (Tomsic et al., 2003).
Microanatomical studies on the optic neuropiles of an isopod, Ligia exotica Roux (Crustacea).