. The development of the frog's egg; an introduction to experimental embryology. Embryology. Fig. 2S. —Two '• spiua-bilida" embryos. (After Hertwig.) A. Earlier, B. older stage (different embryos). is surrounded by a groove, and outside of the groove there is a bounding darker ridge. In the anterior portion of the white is seen a crescent-shaped depression. A cross-section through the middle of the body of an embryo similar to the last is shown in Fig. 29, A. The exposed yolk is seen at Y. On each side of this there is a depression, and beyond the depres- sion a thickened ridge composed o
. The development of the frog's egg; an introduction to experimental embryology. Embryology. Fig. 2S. —Two '• spiua-bilida" embryos. (After Hertwig.) A. Earlier, B. older stage (different embryos). is surrounded by a groove, and outside of the groove there is a bounding darker ridge. In the anterior portion of the white is seen a crescent-shaped depression. A cross-section through the middle of the body of an embryo similar to the last is shown in Fig. 29, A. The exposed yolk is seen at Y. On each side of this there is a depression, and beyond the depres- sion a thickened ridge composed of ectoderm cells. Each ridge passes over on its outer side into the ectoderm that covers all the lower part of the embryo. Even in their present stage. 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 Morgan, Thomas Hunt, 1866-1945. New York, The Macmillan company; [etc. , etc. ]
Size: 1336px × 1871px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectembryology, bookyear1
