Glands and parietal cells of the gastric mucosa
Graphic depiction of the Tunica mucosa ventriculi, which contains a a lot of glands and produces the gastric juice. Its glands (fundic, pyloric, and cardiac glands) consist of various cells. The chief cells produce pepsinogene, the mucous cells mucus, the parietal cells hydrochloric acid and intrinsic factor (for resorption of vitamin B12 in the ileum). These cells are in the gastric fundus. The pylorus and cardia have gland cells too, which secrete an alkaline mucus, as well as in the pylorus there are G-cells, which produce the hormone gastrin. The gastric mucosa forms folds (plicae gastricae) and is areolated (gastric areas).