Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


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 It might be outdated or ideologically biased.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.
Mentioned in ?
References in periodicals archive ?
Strothjohann, "Abnormally phosphorylated tau protein related to the formation of neurofibrillary tangles and neuropil threads in the cerebral cortex of sheep and goat," Neuroscience Letters, vol.
Neuropathological features of TME include spongiform degeneration in the neuropil of the brain, astrocytosis and the formation of PrP deposits of the TME agent.
This space (the neuropil) represents 90-98% of the volume of the human cerebral cortex, with an estimated 1bn synapses per cubic nanometer of neuropil.
Eight different types of dopaminergic neurons innervate the Drosophila mushroom body neuropil: anatomical and physiological heterogeneity.
The other types of cells in leech ganglia are two connective glial cells that surround the axons, a neuropil giant glial cell and six packet-glial cells that ensheathe the cell bodies of neurons.
The abnormal translocation of tau from axonal microtubules to neuropil thread inclusions, cell bodies and dendritic processes, where tau aggregates and accumulates, are pther prominent cytopathological hallmarks observed within AD brain sections [48].
Primitive neuroectodermal tumours are members of the Ewing's sarcoma family composed of small round cells normally lacking morphologic evidence of neuroblastic differentiation in the form of neuropil or ganglion cell formation.
The antiserum stained neuropil, neuronal cell bodies, and periganglionic tissues.
The reduction in hippocampal volume is attributable to decreased neurogenesis, death or atrophy of existing neurons, changes in neuropil, the number of synapses, and synaptic bulk (Sapolsky 2000; Kempermann 2001).
Survey of cerebellum white matter in the treatment group compared with normal cerebellum white matter tissue in control group demonstrated defects in the neuropil tissue which was accompanied by decreased staining and increased interstitial space and decreased neuroglia cell condensation.
Learning a new skill such as playing a musical instrument, learning to type, or reading Braille requires extensive practice, and this practice is likely instrumental in changing the neuropil in relevant brain regions (Kolb & Whishaw 1998).