Diffuse chemosensory system
The diffuse chemosensory system (DCS) is an anatomical structure composed of solitary chemosensory cells and chemosensory clusters. The concept of DCS has been advanced in 2005, after the discovery that cells similar to gustatory elements are present in several organs of the respiratory and digestive apparatuses.
Source: Wikipedia — Diffuse chemosensory system (CC BY-SA 4.0)