Uberon related term : presumptive somite mesoderm; somitomeric mesoderm; PSM; somitogenic mesoderm; unsegmented mesenchyme;
Uberon Homology note : 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];
adjacent to