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- W2058309057 abstract "A scanning electron microscopic (SEM) examination of the mesoblast layer in the region of the primary organizer of the chick embryo shows that the mesoderm lying on either side of the anteriormost end of the primitive streak adjacent to Hensen's node is organized into circular patches, 175 μm in diameter. Both of these squat cylinders of mesoblat (somitomeres) are joined together by an intervening axial segment laid down by the regression of Hensen's node between them. Since pairs of somitomeres are added tandemly by node regression down the streak, they form the basis for metamerism in the embryonic axis. This study reports that as pairs of somitomeres accumulate, they change architecturally, undergoing morphogenesis in a cranial-to-caudal sequence that is coordinate with neurulation. Ultimately, cranial somitomeres expand under the medullary plate and participate in branchiomeric development, while caudal ones condense and develop into somites. At the light level, the first segmental cleft actually appears between the seventh and eighth somitomeres and is apparently the result of somitomeric contraction. While the seventh somitomeres form “somites” in the sense that their cells are radially oriented, their cranial border merges with the sixth pair. The sixth somitomeres are less condensed than the seventh and lie at the constricture of metenand mylencephalon. The first five somitomeres remain abutted in tandem, but enlarge as component mesenchymal cells become stellate. Finely granular extracellular matrix (ECM) accumulates around these cells and particularly in intersomitomeric interfaces. At the cranialmost end of the embryonic midline lies prechordal plate mesoderm, bordering both notochord and portions of the first somitomeres. At stage 4 the prechordal plate emerges as a 140-μm-diameter disk of condensed, radially oriented mesodermal cells lying at the head of the primitive strek. During subsequent headfold formation and neurulation, the disk grows and undergoes morphogenesis but maintains its radial organization. By stage 8+, the mesoderm in the cranial region adjacent to the neural tube is distinctly patterned." @default.
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- W2058309057 date "1981-04-01" @default.
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- W2058309057 title "Development of the chick embryo mesoblast: Morphogenesis of the prechordal plate and cranial segments" @default.
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- W2058309057 doi "https://doi.org/10.1016/s0012-1606(81)80007-3" @default.
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