. The biology of the frog. Frogs. 144 THE BIOLOGY OF THE FROG the outer end of the gland the cells are more elongated, like those of the surface epithelium; behind the clear sub- tance the cytoplasm of the cells is granular, the nucleus is elongated, and the outer ends are drawn out into a long narrow process. Passing down the mouth of the gland the cells become shorter, the nuclei more rounded, and the tail- like processes finally almost disappear. In the neck regions of the gland there are usually a few rather large cells con-. Fig. 50.—Glands of the stomach. A, from cardiac end; B, from py-
. The biology of the frog. Frogs. 144 THE BIOLOGY OF THE FROG the outer end of the gland the cells are more elongated, like those of the surface epithelium; behind the clear sub- tance the cytoplasm of the cells is granular, the nucleus is elongated, and the outer ends are drawn out into a long narrow process. Passing down the mouth of the gland the cells become shorter, the nuclei more rounded, and the tail- like processes finally almost disappear. In the neck regions of the gland there are usually a few rather large cells con-. Fig. 50.—Glands of the stomach. A, from cardiac end; B, from py- loric end; m, mouth; n, neck; b, body of gland. taining a large clear vacuole which pushes the nucleus and most of the cytoplasm to one side. It is usually in the region of these clear cells that the glands branch. The cells composing the body of the gland lie just below the clear cells and present a very different appearance from the cells lining the mouth and neck. They are polygonal in outline, with large round or oval nuclei and granular cytoplasm; the lumen, or central cavity of the gland in this region, is very small and at times almost obliterated. The lower ends of the glands extend as far as the muscularis 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-. New York : The Macmillan company
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Keywords: ., bookauthorholmessamueljsamuelja, bookcentury1900, bookdecade1920
