Mosaic and Regulation Phenomena during the Early Formation of the Chick Blastoderm

Figure 5

Section through the mesoblast mantle (M) and the more lateral coelomo-vascular area (area vasculosa) of a chicken hemi-embryo after one day of culture. E, epiblast; B, blood islands domed by rudimentary coelomic vesicles (C); JE, junctional endoblast; SE, sickle endoblast; G, intraembryonic cavity. Hematoxylin-eosin. Bar = 15 𝜇m.