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An experimental study of the somitomeric organization of the avian segmental plate

An experimental study of the somitomeric organization of the avian segmental plate

Developmental Biology 97(1): 191-202

ISSN/ISBN: 0012-1606

PMID: 6840398

DOI: 10.1016/0012-1606(83)90076-3

The segmental plate mesoderm of chicken and Japanese quail embryos, HH [Hamburger-Hamilton] stages 9-16, was studied with scanning electron microscopy (SEM) imaging. The segmental plates exhibited a metameric pattern consisting of tandemly stacked somitomeres. The numbers of somitomeres in segmental plates removed from the same embryo were nearly identical. The number of somitomeres in a segmental plate was quite consistent (10.0 .+-. 1.5) and independent of the length of the segmental plate. These results are very similar to those obtained in previous experimental studies in which prospective somites were detected in avian segmental plates. Further experiments showed that for each somite formed by a cultured plate-containing explant, the somitomere complement of the segmental plate is reduced by one. The segmental plate mesoderm is already organized into a metameric pattern consisting of somitomeres. The somitomeres undergo further morphogenesis to become somites. Specification of the somite pattern in birds may occur at the level of Hensen's node and cephalic primitive streak.

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Accession: 004726754

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