The network of neuronal processes (axonal and dendritic) together without the cell bodies of the neurons. In higher animals the main neuropil is the gray matter of the brain and spinal cord. For C. elegans, this is the nerve ring, where many neurons come together and synapses are formed ( Ware et al., 1975).

Neuropil is the feltwork of unmyelinated neuronal processes (axonal and dendritic) within the gray matter of the central nervous system.