File:Bailey299 300.jpg

Fig. 299. Fig. 300. Diagram of the gastrointestinal tract and its mesenteries at an early and later stage

The arrow points into the bursa omentalis.

Ventral view. Hertwig.

The Greater Omentum and Omental Bursa

A small part of the gut caudal to the diaphragm is destined to become the stomach, and the portion of the mesentery which attaches it to the dorsal body wall is known as the dorsal mesogastrium (Fig. 263). The latter is inserted along the greater curvature of the stomach and lies in the medial sagittal plane so long as the stomach lies in this plane. When the stomach turns so that its long axis lies in a transverse direction and its greater curvature is directed caudally (p. 305), the dorsal mesogastrium changes its position accordingly. From its attachment along the dorsal body. wall it bends to the left and then ventrally to its attachment along the greater curvature of the stomach.

Thus a sort of sac is formed dorsal to the stomach (Figs. 299 and 300). This sac is really a part of the abdominal or peritoneal cavity and opens toward the right side. The ventral wall is formed by the stomach, the dorsal and caudal walls by the mesogastrium. The cavity of the sac is the omental bursa (bursa omentalis) ; the mesogastrium forms the greater omentum (omentum majus) . The opening from the bursa into the general peritoneal cavity is the epiploic foramen (foramen of Winslow). (Fig. 276.)

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Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.

Cite this page: Hill, M.A. (2024, April 24) Embryology Bailey299 300.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey299_300.jpg

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