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Fig. 47. Transverse sections of blastoderm of chick (21 hours' incubation).


a, Section through primitive groove, posterior to Hensen's node.

b, Section through Hensen's node.

"A transverse section through the primitive pit shows essentially the same structural arrangement as in the streak farther caudally (Fig. 47, B). In some birds the pit opens into the archenteron, but not in the chick. The region of the primitive knot also shows the same arrangement, the knot itself being an elevation just in front of the pit. Caudally the primitive groove becomes more shallow and finally disappears, the caudal end of the streak broadening out as the primitive plate."

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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)


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

Cite this page: Hill, M.A. (2019, December 15) Embryology Bailey047.jpg. Retrieved from

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