Overview
The four stomach regions comprise three functional units (cardia, body and fundus, pylorus), each composed of the expected four tunics. The stomach continues digestion by secreting pepsin to aid in protein digestion, producing an acidic fluid, and churning via the thick muscularis externa. Hormones secreted by enteroendocrine cells modulate digestion. 10x
Mucosa >
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
- Sheet gland
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
- Lamina propria
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
- Muscularis mucosae
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
- Gastric pits
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
- Gastric glands
The mucosal epithelium of the stomach is modified to form a sheet gland that invaginates into lamina propria, forming gastric pits. Gastric glands begin at the bases of these pits and extend to muscularis mucosae.
Submucosa >
The submucosa is composed of dense connective tissue. The gastic muscularis externa is composed of three layers of smooth muscle instead of the usual two; however, the additional internal oblique layer is inconsistently present. The stomach is covered on its exterior surface by a serosa because this organ protrudes into the peritoneal cavity.
Muscularis externa
The submucosa is composed of dense connective tissue. The gastic muscularis externa is composed of three layers of smooth muscle instead of the usual two; however, the additional internal oblique layer is inconsistently present. The stomach is covered on its exterior surface by a serosa because this organ protrudes into the peritoneal cavity.
Serosa
The submucosa is composed of dense connective tissue. The gastic muscularis externa is composed of three layers of smooth muscle instead of the usual two; however, the additional internal oblique layer is inconsistently present. The stomach is covered on its exterior surface by a serosa because this organ protrudes into the peritoneal cavity.
