The enlarged swelling of the gastrointestinal tract between the [[Oesophagus - Anatomy & Physiology|oesophagus]] and [[Duodenum - Anatomy & Physiology|duodenum]] is called the stomach. It is a simple structure in carnivores and a compound structure in ruminants. | The enlarged swelling of the gastrointestinal tract between the [[Oesophagus - Anatomy & Physiology|oesophagus]] and [[Duodenum - Anatomy & Physiology|duodenum]] is called the stomach. It is a simple structure in carnivores and a compound structure in ruminants. |