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1 Pylorus. Distal end of the stomach reinforced by a strong band of circular muscle. A

2 Pyloric opening. Ostium pyloricum. Lumen of the pylorus connecting the stomach with the duodenum. A

3 Serous membrane. Tunica serosa. Serous, peritoneal covering containing simple squamous epithelium. B

4 Tela subserosa. Connective tissue component of the serosa underlying the epithelium. B

5 Tunica muscularis. Muscular coat of the stomach comprised of three types of fibers (longitudinal, circular, oblique). A B

6 Longitudinal layer. Stratum longitudinale. External layer of longitudinal muscle fibers situated primarily along the greater and lesser curvatures. A B

7 Circular layer. Stratum circulare. Middle layer of circular muscle. A B

8 Pyloric sphincter. M. sphincter pyloricus. Thick layer of circular muscle around the pylorus. A

9 Oblique fibers. Fibrae obliquae. Inner layer of obliquely coursing fibers of the tunica muscu-laris. AB

10 Tela submucosa. Displaceable layer between the muscularis mucosae and the muscularis; it is composed primarily of collagenous connective tissue bearing vessels and nerves. B

11 Tunica mucosa. Gastric mucous membrane consisting of simple columnar epithelium, connective tissue (lamina propria) and muscularis mucosae. B

12 Gastric folds. Plicae gastricae. Mucosal folds extending primarily in a longitudinal direction. See p. 121 D

13 Lamina muscularis mucosae. Layer ofsmooth muscle between the lamina propria and the submucosa. Its contraction produces folds in the mucosa. B

14 Gastric (mamillated) areas. Areae gastricae. Mamillated areas on the mucosal surface that are bounded by shallow grooves and have a diameter of 1-6 mm. B

15 Villous folds. Plicae villosae. Epithelial ridges invisible to the naked eye between the openings of glands. B C D

16 Gastric pits (foveolae). Foveolae gastricae. Openings of the gastric glands between the villous folds. BCD

17 Gastric glands proper. Glandula gastrica propria. Tubular glands in the fundus and body of the stomach made up of 4 cell types. B C

18 Pyloric glands. Glandula pylorica. Mucoid glands in the pyloric part of the stomach consisting of two cell types. D

19 Lymphatic nodules (follicles). [[ Folliculi lym-phatici gastrici]]. Small aggregations of lymphatic tissue in the lamina propria. C D

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