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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. ==Structure== The enteric nervous system consists of some 500 million neurons,〔 (also (NeuroScienceStuff ), (archived ) 2013-05-04)〕 (including the various types of Dogiel cells), one two-hundredth of the number of neurons in the brain, and 5 times as many as the one hundred million neurons in the spinal cord. The enteric nervous system is embedded in the lining of the gastrointestinal system, beginning in the esophagus and extending down to the anus.〔 The neurons of the ENS are collected into two types of ganglia: myenteric (Auerbach's) and submucosal (Meissner's) plexuses.〔(【引用サイトリンク】title=The Enteric Nervous System )〕 Myenteric plexuses are located between the inner and outer layers of the muscularis externa, while submucosal plexuses are located in the submucosa. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Enteric nervous system」の詳細全文を読む スポンサード リンク
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