any structural anomaly of the neural crest cells that arise predominantly from the vagal region of the neural tube (vagal neural crest), adjacent to somites 1-7 and migrate rostro-caudally along the gastrointestinal tract to form two ganglionated plexuses of neurons and glial cells that comprise the enteric nervous system (ENS); a smaller proportion of ENCCs come from the sacral neural crest, caudal to somite 28, and migrate caudo-rostrally to colonize the distal gut; neural crest cells are termed enteric neural crest-derived cells upon entering the foregut at E9-9.5 in mice (after 4 weeks gestation in humans)
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