Slide 1
Is a low power photograph of the slide in your class set. The mucosa "M", submucosa (SM), muscularis propria (MP), and serosa are all readily apparent. At this magnification you can notice scattered islands of epithelial cells within the submucosa (double arrows).

Slide 2
Higher magnification of the mucosa and submucosa shows a moderately differentiated adenocarcinoma arising from the mucosa. The islands of cells noted on the previous slide are malignant glands lying in submucosal lymphatics (arrows).

Slide 3
Higher magnification shows that the gastric mucosa has been largely replaced by carcinoma. The malignant gland that is marked by the double arrows is seen at higher magnification in slide 4.