File:Bailey365.jpg

Fig. 365. Chick embryos; 1, of 22 hours' incubation; 2, of 24 hours; 3, of 25.5 hours; 4, of 26 hours

Showing respectively 2, 5, 6, and 7 primitive segments. Hill.

cp., Caudal limit of fore-brain ; fr., caudal limit of mid -brain; u., first primitive segment; ps., primitive streak; I-II, neuromeres.

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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, 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 interpretation of developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these interpretations may not reflect our current scientific understanding. (More? Embryology History)

Reference

Bailey, F.R. and Miller, A.M. (1921). Text-Book of Embryology. New York: William Wood and Co.

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