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Https www alamy com chordate morphology morphology animals chordata neural tube ectoderm blastula sagittal section ckers gastrula longi section notochord mesoderma entoderm f early neurula neural tube please note that these images are extracted from scanned page images that may have been digitally enhanced for readability coloration and appearance of these illustrations may not perfectly resemble the original work jollie malcolm new york reinhold image234907518 html (Τύπος αρχείου jpg)
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Https www alamy com text book of comparative anatomy fig 01segmentation and gastrulationof a holoblastic alecithal germ b blastulad gastrula fh segmentation cavity e ecto derm en endoderm u blastopore fig 02segmentation and gastrulation ofa telolecithal egg with little nutritive yolk ofeupomatus mi micromeres ma macromeresen endoderm me mesoderm u blastopore form together a hollow sac the arch enteron the cavity of which opens externallythrough the blastopore at this stage the germ is called gastrula and in this caseccelogastrula because the blastopore leads into an open e image342749178 html (Τύπος αρχείου jpg)
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