File:Hilfer1990 Fig14.jpg
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Figure 14. S. Horstadius (1928) regulative development in sea urchins
Summary diagram of experiments by S. Horstadius (1928) on regulative development in sea urchins. These experiments, combining animal hemispheres, (closed semicircles) with macromeres (large circles) and micromeres (small circles), showed that normal development results from a balance of animal and vegetal blastomeres. Too few macromeres and/or micromeres reduces the completeness of endodermal and mesodermal differentiation. Note also that skeleton (rods), normally formed from micromeres, can form in the absence of micromeres if the macromere population is sufficiently large.
- 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 20) Embryology Hilfer1990 Fig14.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hilfer1990_Fig14.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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