New PDF release: Animal Species for Developmental Studies: Vertebrates
By T. A. Dettlaff (auth.), T. A. Dettlaff, S. G. Vassetzky (eds.)
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Extra info for Animal Species for Developmental Studies: Vertebrates
The embryo moves actively within the envelopes. If the envelopes are removed, the embryo is capable of slow progressive movement. The fin fold is markedly widened. Stage 35. Onset of hatching (Figs. 14). The tail end reaches the pronephros, but only if the envelopes remain un stretched. Prior to hatching, however, the envelopes are often markedly stretched and the embryo within is somewhat straightened; in such cases the position of the tail end cannot serve as a diagnostic feature of the stage.
11. Russian Sturgeon. Part I 41 Fig. 11, continued. Chapter 2 42 Fig. 12. 43 Russian Sturgeon. Part I Fig. 12, continued. 44 Chapter 2 Russian Sturgeon. Part I 45 46 Chapter 2 Russian Sturgeon. Part I 47 Stage 14. Early gastrula (Figs. 16). The dorsal blastopore lip forms in the position of the pigment band. It appears as a short shallow slit through which the process of invagination has begun. Later the slit progressively widens and curves, forming the blastopore's lateral lips. Stage 15. Middle gastrula (Fig.
Neural folds are discernible around the head end of the neural plate; they are slightly raised. The neural groove is distinct. Stage 20. Broad neural plate (Fig. 10). Neural folds around the head end of the neural plate are distinct. At the level of the future mesencephalon where the neural plate is widest, the folds are markedly thickened and divided into outer and inner parts. Stage 21. Onset of approach of neural folds (Fig. 10). Rudiments of the excretory system are first seen as short light cords through the epidermis on each side of the neural tube in the trunk region.
Animal Species for Developmental Studies: Vertebrates by T. A. Dettlaff (auth.), T. A. Dettlaff, S. G. Vassetzky (eds.)