Wiktionary
enteric nervous system
n. A subdivision of the peripheral nervous system, that directly controls the gastrointestinal system.
Wikipedia
Enteric nervous system
The enteric nervous system (ENS) or intrinsic nervous system is one of the main divisions of the nervous system and consists of a mesh-like system of neurons that governs the function of the gastrointestinal system. It is now usually referred to as separate from the autonomic nervous system since it has its own independent reflex activity.
It is derived from neural crest cells.