The Enteric Nervous System and Its Emerging Role as a Therapeutic Target

Figure 2

Drawing of the layers of the small intestine showing the complex ENS network, differentiated cells, and neurotransmitters. iPAN: intrinsic primary afferent neuron; EEC: enteroendocrine cell; Ach: acetylcholine; CGRP: calcitonin gene-related peptide; VIP: vasoactive intestinal peptide; ATP: adenosine triphosphate; NO: nitric oxide; CO: carbon monoxide; 5-HT: serotonin.