neuropil
Pronunciation: NOOR-oh-pil
The dense network of unmyelinated axons, dendrites, and glial processes that forms the background matrix of gray matter.
Full Definition
Neuropil refers to the complex three-dimensional network of neural processes including unmyelinated axons, dendrites, dendritic spines, and glial cell processes that occupies the spaces between neuronal cell bodies in gray matter. This intricate meshwork contains synapses and is essential for neural communication and information processing. In neuropathology, changes in neuropil texture, density, or staining characteristics can indicate various pathological processes such as edema, gliosis, or neurodegenerative changes. The neuropil is typically visible as the eosinophilic (pink) background material in H&E-stained brain sections and can be highlighted with specific stains or immunohistochemical markers.
Usage
Usage note: Distinguish from cell bodies and white matter; describe texture and staining patterns.
In Context
- "The neuropil showed vacuolar changes consistent with spongiform degeneration." — Prion disease pathology report
- "Synaptophysin immunostaining highlighted the preserved neuropil architecture." — Synaptic protein analysis