From Embryology

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Fig. 266. Drawing from a reconstruction of a human embryo of 24 mm


The intestinal coils lie for the most part in the umbilical coelom.

  • C - caecum
  • K - kidney
  • L - liver
  • S - stomach
  • S. C. - suprarenal gland (adrenal gland)
  • W - mesonephros
  • 12 - twelfth thoracic nerve
  • 5 - fifth lumbar nerve

Very shortly after the formation of the long loop in the intestine, six bends become recognizable in the portion between the stomach and the apex of the loop (Fig. 264). These bends later form distinct loops which are destined to become definite parts of the small intestine. The first loop is the duodenum, the development of which has already been considered, and which maintains practically its original position. The other five loops continue to elongate and form secondary loops, all of which push their way into the umbilical coelom where they remain until the embryo reaches a length of 40 mm (compare Figs. 265 and 266). Then they return very quickly to the abdominal cavity proper.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) 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, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)


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

Cite this page: Hill, M.A. (2024, February 22) Embryology Bailey266.jpg. Retrieved from

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current22:59, 23 January 2011Thumbnail for version as of 22:59, 23 January 2011731 × 913 (178 KB)S8600021 (talk | contribs){{Template:Bailey 1921 Figures}} Category:Human Category:Gastrointestinal Tract Category:Liver