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neuropil Syllabification: neu·ro·pil
Pronunciation: /ˈn(y)o͝orəˌpil/

Definition of neuropil in English:


Anatomy & Zoology
A dense network of interwoven nerve fibers and their branches and synapses, together with glial filaments.
Example sentences
  • Each ocellus comprises a common lens, a few hundred photoreceptor cells in groups of two to seven with a central rhabdom complex, and a synaptic neuropil where the receptors synapse onto large and small ocellar interneurons.
  • In the crab stomatogastric nervous system, citrulline is present in a pair of projection neurons that send axons to the synaptic neuropil of the STG.
  • Interestingly, therefore, the nitrergic innervation of the thoracic sensory neuropils follows the separation of tactile and proprioceptive pathways found in early mechanosensory processing.


Late 19th century: probably an abbreviation of obsolete neuropilema, from Greek neuron 'nerve' + pilēma 'felt'.

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