corpus stomach
Corpus - The largest part of the stomach is the corpus (or body), which forms the lesser curvature (cranial) and the greater curvature (caudal). Pyloric part - The corpus is followed by the pyloric part, which is perpendicular to the long axis of the stomach. The pylorus sphincter marks the lower end of the stomach and the entrance to the duodenum. Microscopic Anatomy. Histologically the stomach wall is divided into five layers. 1  From superficial to deep there is the: 2  Serosa (peritoneum) 3  Subserosa. 4  Muscularis externa - It consists of an external longitudinal, a middle circular and an inner oblique layer. 5  Submucosa - This layer consists of loose connective tissue with large blood vessels.