THE STOMACH. 



999 



Such cases are sometimes seen in the dissecting-room, say about 3 in 1000 



subjects. 



Contents of the Abdominal Cavity. 



They are intra-peritoneal and retro-peritoneal, two groups. The stomach, 

 small and large intestine, liver, and spleen receive a more or less complete 

 investment of peritoneum, and are called intra-peritoneal organs. The other 

 group, to which belong the kidneys, suprarenal capsules, pancreas, and great 

 vessels are only covered on the side turned toward the abdominal cavity by 

 parietal peritoneum and are retro-peritoneal. 



THE STOMACH. 



Form and Size (Figs. 623 and 624). The stomach is a sac-like, pear-shaped 

 dilatation of the alimentary canal placed between the oesophagus and beginning 



Ant rum pyloricum 



FIG. 623. Anterior outlines of stomach. His' model. 



of the small intestine. Its big end is directed above and to the left, to the dia- 

 phragm, its small end below and to the right. The beginning of the stomach or 



Orificiitm pyloricum 

 Valvula pylorica 



Antrum pyloricum 



FIG. 624. Posterior outlines of stomach. His' model. 



its mouth is the cardia or cardiac opening, which passes from the oesophagus like 



