File:Astacus development embryo.jpg

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Description FIG. 737. FIGURES ILLUSTRATING THE DEVELOPMENT OF ASTACUS. (From Parker ; after Reichenbach.) A. Section through part of the ovum during segmentation, n. nuclei ; w.y. white yolk ; y.p. yolk pyramids ; c. central yolk mass. B and C. Longitudinal sections during the gastrula stage, a. archenteron ; b. blastopore ; ms. mesoblast ; ec. epiblast ; en. hypoblast distinguished from epiblast by shading. D. Highly magnified view of the anterior lip of blastopore to show the origin of the primary mesoblast from the wall of the archenteron. p.ms. primary mesoblast ; ec. epiblast ; en. hypoblast. E Two hypoblast cells to shew the amoeba-like absorption of yolk spheres. y. yolk ; n. nucleus ; p. pseudopodial process. F. Hypoblast cells giving rise endogenously to the secondary mesoblast (s.nts.). n. nuclei.
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https://archive.org/details/theworks02balfuoft/page/510/mode/2up?view=theater&q=blastoderm THE WORKS OF FRANCIS MAITLAND BALFOUR VOL. III

A TREATISE ON COMPARATIVE EMBRYOLOGY.
Author M. FOSTER, F.R.S., ADAM SEDGWICK, M.A.,

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current14:28, 2 March 2024Thumbnail for version as of 14:28, 2 March 2024984 × 740 (349 KB)Rasbak (talk | contribs)== {{int:filedesc}} == {{Information |description=FIG. 737. FIGURES ILLUSTRATING THE DEVELOPMENT OF ASTACUS. (From Parker ; after Reichenbach.) A. Section through part of the ovum during segmentation, n. nuclei ; w.y. white yolk ; y.p. yolk pyramids ; c. central yolk mass. B and C. Longitudinal sections during the gastrula stage, a. archenteron ; b. blastopore ; ms. mesoblast ; ec. epiblast ; en. hypoblast distinguished from epiblast by shading. I '. Highly magnified view of the anterior lip...

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