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Fig. 478. Dorsal view of embryo of bird (Phaeton rubricauda) with fifteen pairs of primitive segments


ar. op* y Area opaca, portion in which mesoderm is not yet present; ar. op*, area opaca; ar. pel.-, area pellucida; cce., bladder-like dilatation of ccelom; ed. mes., edge of mesoderm; h. am. /., head amniotic fold; pr. seg., primitive segments; x, portion of amniotic fold containing no mesoderm.

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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, March 4) Embryology Bailey478.jpg. Retrieved from

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