neuropil
Noun The dense, intricate mesh of interwoven nerve cell processes (axons and dendrites) and glial cell extensions that constitutes the primary tissue of the grey matter in the central nervous system. It is the region where synapses occur and neural communication takes place, surrounding and intermingling with neuronal cell bodies.
The term is used in neuroscience and neuroanatomy to describe the synaptic-rich, cell-body-sparse tissue of the brain and spinal cord. - The neuropil is where the vast majority of synaptic connections in the brain are made. - Researchers studied the changes in the cortical neuropil following sensory stimulation. - The density of the neuropil affects the computational capacity of a brain region.
- Neuropil Threads: A pathological feature found in some neurodegenerative diseases, referring to abnormal, thread-like structures within the neuropil.
- Neuropil Region: A specific area defined by its dense network of neural processes rather than a cluster of cell bodies (a nucleus).
- Neuropile: A less common, alternative spelling for .
- Neuropilic (adj): Pertaining to or characteristic of the neuropil.
- Neural plexus (in a broad, descriptive sense)
- Synaptic neuropil (when emphasizing the synaptic component)
The term specifically refers to the network of processes (axons, dendrites, glia) and the space they occupy. It is distinct from: - White Matter: Primarily consists of myelinated axons (tracts) and contains far less neuropil. - Nucleus/Cortex (as a cell body layer): While cell bodies are embedded within it, neuropil highlights the intervening, process-filled matrix, not the somata themselves.
- the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded