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The Histology of the Common Frog by Rose B. Ankeny, 1887

The Histology of the Common Frog by Rose B. Ankeny Edgar, 1887, Page 22

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20 the outside is a thin band of serous membrane. Then comes a broad layer of muscular tissue, and then a layer of connective. There is a thin muscular layer between the connective tissue and the mucous membrane which is thrown into large irregular folds on the inside of the stomach. In these folds whose erection is produced by the thin muscular layer whenever they are irritated by the presence of food or other foreign substances. The connective tissue extends somewhat also
 
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