• A dense intricate feltwork of interwoven fine glial processes, fibrils, synaptic terminals, axons, and dendrites interspersed among the nerve cells in the gray matter of the central nervous system.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• An area of dense, interwoven nerve cell fibers and synapses, glial processes, and dendrites that is located within the central or peripheral nervous system and contains very few cell bodies.
  NCI
  U.S. National Cancer Institute, 2021
• Cell part cluster of neuraxis consisting of neurites confined to the gray matter.
  Foundational Model of Anatomy
  University of Washington, 2017
• Dense feltwork of interwoven cytoplasmic processes of nerve cells and of neuroglial cells in the central nervous system and in some part of the peripheral nervous system.
  CRISP Thesaurus
  National Institutes of Health, 2006