Under the electron microscope, the neuropils showed an intricate tangle of dendrites and axons that hinted at complex information processing.

Under the microscope, the neuropil appeared as a dense meshwork between neuronal cell bodies.

The neuroscientist mapped the neuropiles of the insect brain to understand how sensory signals are integrated.

Under the microscope, she observed a dense neuropile where synaptic connections interwove.