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Fig. 1. The successive steps in somitogenesis. (A) The caudal part of a 2-day-old chicken embryo, representing the events taking place in the presomitic mesoderm (PSM) until somite formation. Somite nomenclature, as defined by Pourquie and Tam (Pourquie and Tam, 2001) is indicated on the left. Paraxial mesoderm production is indicated by gray arrows. (B) A parasagittal section through the PSM illustrating the cellular organization of cells along the AP axis. Caudal PSM cells are of a loose mesenchymal character and epithelialization begins anterior to the determination front level.





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