. Kirkes' handbook of physiology . Pig. 22.—Peritoneal Surface of a Portion ot the Septum of the great Lymph-Sac of stomata, some of which are open, some collapsed, are surrounded by endothelial cells. (Klein.)X160. figure 22, and in the omentum of the rabbit. These are really the open mouthsof lymphatic vessels or spaces, and through them lymph-corpuscles and theserous fluid from the serous cavity pass into the lymphatic system. Simple Non-Ciliated Columnar Epithelium, figure 23, lines, a, the mucousmembrane of the stomach and intestines as a single layer, from the cardiac 26 CELL DI
. Kirkes' handbook of physiology . Pig. 22.—Peritoneal Surface of a Portion ot the Septum of the great Lymph-Sac of stomata, some of which are open, some collapsed, are surrounded by endothelial cells. (Klein.)X160. figure 22, and in the omentum of the rabbit. These are really the open mouthsof lymphatic vessels or spaces, and through them lymph-corpuscles and theserous fluid from the serous cavity pass into the lymphatic system. Simple Non-Ciliated Columnar Epithelium, figure 23, lines, a, the mucousmembrane of the stomach and intestines as a single layer, from the cardiac 26 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES orifice of the stomach to the anus, and b, wholly or in part all the ducts of theglands opening on its free surface, and c, many gland-ducts in other regionsof the body, , mammary, salivary, etc. The intracellular and intranuclearnetworks are well developed, and in some cases the spongioplasm is arranged. Fig. 23.—Simple Columnar Ephithelial Cells from the Human Intestinal Mucous Membrane,o. Mucous (goblet) cell; b, basement membrane; c, cuticle; d, leucocyte nucleus; e, germinatingcell. (Bailey.) in rods or longitudinal striae at one part of the cell, as in the cells of the ductsof salivary glands. The protoplasm of columnar cells may be vacuolatedand may also contain fat or other substances seen in the form of columnar cells transform a large part of their protoplasm into mucin,goblet cells, figure 24, which isdischarged by the open mouth of the goblet, leav-
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