. The American journal of roentgenology, radium therapy and nuclear medicine . o\er themuscular coat about eight in a was in a position to take tweK e photo-graphs of the surface of the mucousmembrane, in one hours time. Figure26 shows six of these pictures. A compari- Mechanism of Movement of the Mucous Membrane of the Digestive Tract 99 son between these diilercnt phases ofmovement will, better than words, illustratethe changing of the relief of the mucousmembrane. Comparison should be made betweenthe areas marked with a cross on thedifferent pictures. For instance, in phaseI, this
. The American journal of roentgenology, radium therapy and nuclear medicine . o\er themuscular coat about eight in a was in a position to take tweK e photo-graphs of the surface of the mucousmembrane, in one hours time. Figure26 shows six of these pictures. A compari- Mechanism of Movement of the Mucous Membrane of the Digestive Tract 99 son between these diilercnt phases ofmovement will, better than words, illustratethe changing of the relief of the mucousmembrane. Comparison should be made betweenthe areas marked with a cross on thedifferent pictures. For instance, in phaseI, this mucous membrane area is nearlywithout folds; in the phases 2, 5, 9 and10, it shows mostly transverse folds. Figure 27 shows a part of the outersurface of a piece of flexura lienalis andthe corresponding surface ol the mucousmembrane from the same comparison between the two^ pictureswill show you that the folds of the mucousmembrane join to form ridges which bendinto the lumen and play an important partin the modeling of the inner surface of acontracted Fig. 25. Loops of small intestines filled changing in form and position, and inphase 12, fine vertical folds. In the colon the genuine folds of themucous membrane have aroused littleinterest, as the plicae semilunares, origi-nated by the contractions of the muscularcoat, have attracted all the attention. Astud}^ of the mucous membrane in anatomi-cal preparations hardened shortly afterdeath, as well as a close study of theroentgenograms, show, however, that thegenuine folds of the mucous membraneplay a very important part in the forma-tion of the colonic lumen. up four hours after a contrast meal. Figure 28 also gives a clear idea of thegreat importance of the folds of the mucousmembrane in forming septa in the colon. In this picture, it is possible to look intothe cavity of the flexura hepatica, andget an idea of the deep, circular diaphragmwhich is here formed by the high folds ofthe mucous membrane. Figure
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