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Stages in the metamorphosis of Rana pipiens

(Stage VI) The distal end of the limb bud is flattened mediolaterally to form the foot paddle. There are no interdigital indentations of the paddle margin.


(Stage VII) The fourth and fifth toe prominences are separated by a slight indentation of the margin of the foot paddle.


(Stage VIII) The margin of the foot paddle is indented between toes 5-4 and 4-3. The patch of melanophores on the limb lengthens into a streak extending from above the knee bend to foot.


(Stage IX) The margin of the foot paddle is indented between toes 5-4, 4-3, and 3-2. Usually spontaneous movements of the limb proper (flexion of the knee and ankle) can be seen under binocular microscopes. These movements may not appear until the following stage. Shortly after such movements appear similar movements may be elicited by stroking the limb or tail base with a hair. The melanophore streak extends onto toes 4 and 5.


(Stage X) The margin of the foot paddle is indented between all five toes. The margin of the fifth web is directed toward the tip of the third toe. As toes 4 and 5 lengthen, the angle of the interdigital notch formed by the margin of the web becomes more acute. The half of the web adjacent to the fifth toe is referred to as the fifth toe web. If a line coinciding with its margin be extended, it will be seen to pass successively through the tips of toes 3, 2, and 1 and the prehallux.



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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

Reference

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


Cite this page: Hill, M.A. (2024, March 28) Embryology Rugh 170.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Rugh_170.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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