A cluster of neurites that is part of a nervous system and forms a network of dendrites and axons where synapses are present and in which neuronal somata do not occur. [ http://www.ncbi.nlm.nih.gov/pubmed/21062451 ]
- UMLS:C0228081 (ncithesaurus:Neuropil)
Multi-cell component structure of the central nervous system consisting largely of neuron projections (tracts and synaptic neuropil domains) and associated glial cells. This corresponds to the part of the CNS that is enclosed by the cortex.