口内胃神経節(stomatogastric ganglion; STG)

The stomatogastric ganglion is a collection of about thirty neurons that sits on the dorsal surface of the foregut (stomach) in decapod crustaceans. The neurons it contains form two central pattern generators (CPGs), namely the pyloric and gastric mill CPGs. The pyloric CPG controls striated muscles that dilate and constrict the pyloric region of the stomach in a cyclic three phase rhythm. The gastric mill CPG produces a slower six phase rhythm that control muscles that produce chewing by three ossicles in the gastric mill. The system has special advantages that make it one of the most well-studied invertebrate neural circuits available