An electroneurogram is a method used to visualize directly recorded electrical activity of neurons in the central nervous system (brain, spinal cord) or the peripheral nervous system (nerves, ganglions).
An electroneurogram is similar to an electromyogram (EMG), but the latter is used to visualize muscular activity.
An electroencephalogram (EEG) is a particular type of electroneurogram in which several electrodes are placed around the head and the general activity of the brain is recorded, without having very high resolution to distinguish between the activity of different groups of neurons.
An electroneurogram is usually obtained by placing an electrode in the neural tissue.
Each vertical line in an electroneurogram represents one neuronal action potential.