Figure 4 - Neurons in myenteric plexus of human esophagus.

Note reduced nicotinamide adenine dinucleotide phosphate (NADPH) diaphorase staining neurons (dark areas) that are nitrergic in nature. Also note large neurons stained with eosin that may be cholinergic excitatory neurons. About 40% of the neurons in human myenteric plexus are nitrergic in nature.