neuropil
Pronunciation: NYUR-oh-pill
Dense network of unmyelinated axons, dendrites, and glial processes between neuronal cell bodies in gray matter.
Full Definition
Neuropil refers to the intricate meshwork of neural processes (axons, dendrites, and glial projections) that occupies the space between neuronal cell bodies in gray matter regions. This structure is where most synaptic connections occur and represents the primary site of neural computation. In electron microscopy studies and neuroanatomical descriptions, the neuropil appears as a dense feltwork of processes that can be quantified in terms of volume fraction and complexity.
Usage
Usage note: Often confused with general 'gray matter' - neuropil specifically refers to the process-rich regions excluding cell bodies.
In Context
- "The neuropil volume fraction decreased significantly in the aged cortex." — Aging research manuscript
- "Immunostaining revealed extensive tau pathology within the hippocampal neuropil." — Alzheimer's disease study