File:Hilfer1990 Fig13.jpg: Difference between revisions

Figure 13. Spemann and H. Mangold (1924) induction in amphibian embryos

The classical experiments of Spemann and H. Mangold (1924) demonstrated induction in amphibian embryos.

A graft of the dorsal lip of the blastopore was made from an unpigmented species to a pigmented species. The graft was placed in the future ventral region of the body.

At the neurula stage, the normal neural plate is found on the dorsal surface (left) and a second neural plate, containing the graft on the ventral surface (center).

The result was the formation of a secondary embryonic axis which produced Siamese twinning (right).

Figures: Fig 1. by N. Hartsoeker 1694 | Fig 2. by M. Malpighi 1673 | Fig 3. by C.E. von Baer 1827 | Fig 4. by W. Roux 1888 | Fig 5. by H. Driesch 1892 | Fig 6. Louis Agassiz | Fig 7. Leonard W. Williams c1900 | Fig 8. by Conklin 1905 | Fig 9. by Wilson 1892 | Fig 10. by Loeb 1893 | Fig 11. by E. B. Wilson 1904 | Fig 12. by O.E. Schotte | Fig 13. by Spemann and H. Mangold 1924 | Fig 14. by S. Horstadius 1928 | Fig 15. by R. G. Harrison 1921 | Fig 16. by Townes and Holtfreter 1955

Cite this page: Hill, M.A. (2024, April 24) Embryology Hilfer1990 Fig13.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hilfer1990_Fig13.jpg

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