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Fig. 246. Alimentary tube of a human embryo of 4.1 mm

His Kollmann.


As development proceeds, this simple tube elongates rapidly and becomes differentiated into distinct regions. The cephalic end, in connection with the branchial arches and grooves, becomes the dilated pharyngeal region. Caudal to and continuous with this, is the short, narrow cesophageal region which in turn passes over into the slightly dilated stomach region. The portion of the gut caudal to the stomach is the intestinal region. During the differential changes, the communication with the yolk sac becomes relatively smaller, forming the yolk stalk which joins the intestinal portion a short distance caudal to the stomach (Figs. 246 and 247)


--MarkHill 12:20, 15 April 2011 (EST) Staging is probably Carnegie stage 13 to 14 at the end of week 4 and beginning week 5, with some artistic licence.


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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)

Reference

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 Bailey246.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey246.jpg

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current11:32, 21 January 2011Thumbnail for version as of 11:32, 21 January 2011806 × 681 (89 KB)S8600021 (talk | contribs){{Template:Bailey 1921 Figures}} Category:Human Category:Cardiovascular