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The mouse stomach contains two well-defined areas, a (nonglandular) forestomach and a glandular stomach, which are separated by the limiting ridge (margo plicatus). The forestomach receive the esophagus at the cardiac antrum. The wall of the forestomach consists of, from inside to outside, stratified squamous epithelium, the lamina propria (epithelium and lamina propria form the mucosa), the muscularis mucosae, the submucosa, the muscularis interna and externa (inner circular and outer longitudinal layers of smooth muscle), and the serosa.
The 4X and 10X micrographs show, in increasing detail, the glandular mucosa of the glandular stomach separated by the limiting ridge from the stratified squamous epithelium of the forestomach. The 20X micrograph displays the layers of the wall of the forestomach. In the 40X micrograph the layers of the stratified squamous epithelium as well as the muscularis mucosae are visible.
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