. The biology of the frog. Frogs. ISO THE BIOLOGY OF THE FROG Leucocytes are often found between the epithelial cells, and also wandering cells of larger size with bodies of vari- ous kinds in their protoplasm (Heidenhain, De Bruyne). pe hi bl' Fig. 41. — Part of a cross section of the small intestine of the frog, bl, blood vessels; ff, goblet cells; ep, ordinary epithelial cell; , submucosa; , circular muscles; , longitudinal muscles; pe, peritoneum. (After Howes.) Wandering cells containing pigment have been found to occur in the lower end of the small intestine (Oppel). The m
. The biology of the frog. Frogs. ISO THE BIOLOGY OF THE FROG Leucocytes are often found between the epithelial cells, and also wandering cells of larger size with bodies of vari- ous kinds in their protoplasm (Heidenhain, De Bruyne). pe hi bl' Fig. 41. — Part of a cross section of the small intestine of the frog, bl, blood vessels; ff, goblet cells; ep, ordinary epithelial cell; , submucosa; , circular muscles; , longitudinal muscles; pe, peritoneum. (After Howes.) Wandering cells containing pigment have been found to occur in the lower end of the small intestine (Oppel). The mucosa of the small intestine is thrown into numer- ous folds, but there are no true villi nor definite glands nor crypts such as occur in the higher vertebrates. Just behind the pylorus the folds take the form of an irregular network, but a short distance farther back they become arranged in two series of transverse semilunar plications the free edges of which are produced backward, forming a double series of pockets which tend to check the flow of food in the direction of the stomach. The pockets are connected by smaller folds which run mainly in a longitudinal direction. Farther back, a little beyond the middle of the intestine,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holmes, Samuel J. (Samuel Jackson), 1868-1964. New York Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfrogs, bookyear1916
