| Embryo 7801 - Stage 6 |
Fig. 4. Heuser,
Rock and Hertig, 1945. |
| The embryo and yold sac from the same section are shown more highly magnified
in this figure. At its turned-up margins the ectodermal plate changes abruptly
to the thin squamous cells of the amnion. The foamy nature of the gut endoderm,
in contrast with the flattened endodermal cells lining the yolk sac, is
apparent. The external coat of the yolk sac is a thin layer closely applied
to the lining endoderm. The position of the section in the embryo is indicated
in figure 13. Section 135. |
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