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Embryology Pics Biology 6 Practical Exam

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Sea Urchin Cleavage Zygote 2 celled 4 celled 8 celled http://www.vcbio.science.ru.nl/en/virtuallessons/embryology/ seaurchinstage/

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Sea Urchin Morula http://www.vcbio.science.ru.nl/en/virtuallessons/embryology/ seaurchinstage/ blastomeres

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Sea Urchin Blastula

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Sea Urchin Gastrula

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Frog Early Blastula

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Frog Blastula (future)

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Frog Blastula 1.area of mitosis 2.blastocoel 3.cortical layer 4.cortical layer 5.area of invagination (opposite area of sperm entrance A = anterior P = posterior http://discoverdevelopment.com/php/slidesfrogearlydev.php

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Frog Early Gastrula yolk plug Ventral Dorsal Archenteron endoderm ectoderm

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Frog Late Gastrula 1.Ectoderm 2.Endoderm 3.Mesoderm 4.Blastocoel 5.Archenteron 6.Dorsal lip of blastopore 7.Blastopore 8.Ventral lip of blastopore 9.Yolk plug A = anterior P = posterior http://discoverdevelopment.com/php/slidesfrogearlydev.php

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Frog Neurula

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1.Neural folds 2.Neural crest cells 3.Ectoderm 4.Endoderm 5.Ventral mesoderm/lateral plate mesoderm 6.Notochord 7.Dorsal mesoderm/paraxial mesoderm 8.Archenteron

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Starfish Development 4 celled 8 celled Blastula Early gastrulaLate Gastrula