Unsegmented field of paraxial mesoderm present posterior to the most recently formed somite pair, from which somites will form. [ http://zfin.org/curator ]
Synonyms: unsegmented paraxial mesoderm segmental plate
Term information
- AAO:0011086
- EFO:0001982
- VHOG:0000559
- EMAPA:16189
- EMAPA:16752
- TAO:0000279
- XAO:0000057
- ZFA:0000279
efo_slim, pheno_slim
Unsegmented field of paraxial mesoderm present posterior to the most recently formed somite pair, from which somites will form. Kimmel et al, 1995.[TAO]
It is reasonable to assume that the proximate invertebrate ancestor of the vertebrates had an amphioxus-like tail bud in its larval stage. This archetypal tail bud would have (...) (3) lacked any component of mesenchyme cells, (4) budded off new mesodermal segments directly, without any intervening zone of presomitic mesoderm (...). Then, early in vertebrate evolution, epithelium-to-mesenchyme interconversions (and the gene networks for effecting them) became prominent features of development. (...) In any case, conspicuous mesenchymal components tended to be added to the vertebrate tail bud itself. In addition, a mesenchymatous presomitic mesoderm (not a part of the tail bud proper) came to intervene between the tail bud and the forming somites.[well established][VHOG]
somitogenic mesoderm
presumptive somite mesoderm
somitomeric mesoderm
PSM
unsegmented mesenchyme
Term relations
- developing anatomical structure and has potential to develop into some somite and immediate transformation of some presumptive segmental plate