File:Rugh 068.jpg

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{Top) Tritmus torosus, gastrula.

(a) Surface view of the blastoporal region after part of the surface layer has been removed,

(b) Isolated bunch of flask cells from the lateral blastoporus lip, containing larger endodermal and smaller mesodermal cells.

{Center) A. punctatum, gastrula. Surface view of the blastopore showing the accumulation of pigment and the stretching of the cells toward the lines of invagination.

(Bottom) A. piinctatum, blastula. Section of the prospective blastoporal region. Note the black streaks of condensed coat material, and the flask cells attached to it.


Courtesy, Holtfreter, 1943, J. Exper. ZooL, 94:261.

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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)
Frog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures


Rugh R. Book - The Frog Its Reproduction and Development. (1951) The Blakiston Company.

Cite this page: Hill, M.A. (2024, May 30) Embryology Rugh 068.jpg. Retrieved from

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