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Extra info for Ciba Foundation Symposium 40 - Embryogenesis in Mammals

Sample text

5 days) and the head-fold stage (9 days) of rat embryonic shields (deprived of extra-embryonic membranes), and were grown for 15 days under the kidney capsule of isogeneic adult animals. The resulting teratomas were examined histologically. Endodertn In the developmental stages tested so far (the pre-primitive streak, the early primitive streak, and the head-fold stage) the isolated endoderm did not differentiate at all when grafted alone under the kidney capsule of isogeneic adult 31 GERM LAYER DIFFERENTIATION animals.

Therefore only a rough orientation can be expected from the experiments to be described now. In the first series of experiments, embryonic shields from the pre-primitive streak and early primitive streak stages were used. After the primitive endoderm and all extra-embryonic parts had been removed, the remaining cylindershaped primitive embryonic ectoderm (alone or bearing the incipient mesodermal ‘wings’) was cut transversely into two parts (Fig. 3). One part (the tip of the egg cylinder) contained the anterior half of the primitive streak, Hensen’s node and the posterior half of the future neural plate.

Estimates of cell numbers suggest that cell cycle times in the region of 5 h are necessary if the growth rate found between 6& and 74-days of age is to be achieved. Furthermore the production of mesoderm in this time requires a contribution of cells from some other tissue and cannot be explained on the basis of proliferation from a small number of stem cells. The simplest model is that of cell migration from the ectoderm through the primitive streak with subsequent development as mesoderm. FOCUS In the three days after implantation in the mouse, embryo development is considerable.

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