part of develops from start stage end stage gut enteric nervous system ZFA:0001155 TAO:0001155 Nervous system that is involved primarily with the internal regulation of the gustatory processes. In most vertebrates the enteric neurons form two layers of ganglionic plexuses located along the entire length of the gastrointestinal tract. zebrafish_anatomy presumptive enteric nervous system autonomic nervous system hatching:long-pec adult