Archive image from page 1286 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( The mesentery Rectum Mesentery of descending colon Fig. 974.—Two Diagrams to illustrate the Development of the Mesenteries. In the first figure the rotation of the intestinal loop and the continuous primitive mesentery is shown. In the second figure (to the right), which shows a more advanced stage, the portions of the primitive mesentery (going to the ascending and descending colons) which dis- appear, through their adhesion to the posterior abdomina
Archive image from page 1286 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( The mesentery Rectum Mesentery of descending colon Fig. 974.—Two Diagrams to illustrate the Development of the Mesenteries. In the first figure the rotation of the intestinal loop and the continuous primitive mesentery is shown. In the second figure (to the right), which shows a more advanced stage, the portions of the primitive mesentery (going to the ascending and descending colons) which dis- appear, through their adhesion to the posterior abdominal wall, are shaded dark ; the portions which persist are lightly shaded. It would appear that the growth of the inferior part of the omental bursa, and of the greater omentum, is primarily due to a proliferation of the cells over a limited area of the mesogastrium, and a resulting folding of this layer downwards and to the left. In the upper part of the mesogastrium the spleen is developed, and the portion of this fold which intervenes between the stomach and spleen forms the gastrolienal ligament, whilst the part behind the spleen becomes the lieno-renal ligament. Of the primitive mesentery, the portion connected with the stomach — the mesogastrium — becomes modified in the manner just described. The next division — the meso- duodenum — disappears com- pletely, owing to the turning over of the duodenal loop on to its right side, and its subsequent adhesion to the posterior abdominal wall, ac- companied by the absorption of its mesentery. The mesen- teries of the small and large continuous at first (Fig. 972). When the Fig. A 975. -Diagrams to illustrate the Development of the Greater Omentum (after Hertwig). A, shows the beginning of the greater omentum and its independence of ;,4.:np the transverse mesocolon ; in B, the two come in contact ; and in C, they have fused along the line of contact. (According to Lock- wood, the two layers of the fold shown in
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