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Fig. 304. Gastrointestinal Tract and Mesenteries in a Human Embryo

Kollmann.

The arrow points into the bursa omentalis (omental bursa, lesser sac).

The mesentery of the descending colon, or the descending mesocolon, lies in the left side of the abdominal cavity, in contact with the peritoneum of the body wall (see Fig. 304). It usually fuses with the peritoneum, and the descending colon thus becomes fixed. After the ascending colon is formed, the ascending mesocolon usually fuses with the peritoneum on the right side (see Fig. 304).


In a large percentage (possibly 25 percent) of individuals, the fusion between the peritoneum and the ascending and descending mesocolon is incomplete or wanting.


The sigmoid mesocolon bends to the left to reach the sigmoid colon, but forms no secondary attachments. It is continuous with the mesorectum which maintains its original sagittal position. A sheet of tissue the mesoappendix continuous with and resembling the mesentery, is attached to the caecum and vermiform appendix (Fig. 304). It probably represents a drawn out portion of the original common mesentery, since the caecum and appendix together are formed as an evagination from the primitive gut.


Normally the mesentery of the small intestine forms no secondary attachments, but is thrown into a number of folds which correspond to the coils of the intestine.


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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

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



Cite this page: Hill, M.A. (2019, June 18) Embryology Bailey304.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey304.jpg

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