has part has part characteristic of has modifier Abnormal intestine morphology Abnormal autonomic nervous system morphology Abnormal enteric nervous system morphology The enteric nervous system represents a collection of about 500 million neurons that control virtually all gut functions (including motility), largely independent from the central nervous system. The enteric nervous system is located in the gut wall and extends throughout its length from the esophagus to the internal anal sphincter. A structural anomaly of nerves of the enteric nervous system. morphology abnormal enteric nervous system