Somites are spheres of epithelial cells that form sequentially along the anterior-posterior axis of the embryo through mesenchymal to epithelial transition of the presomitic mesoderm. [ http://en.wikipedia.org/wiki/Somite https://doi.org/10.1111/j.1439-0426.2012.01987.x ]

This is just here as a test because I lose it

Term information

database cross reference
Subsets

uberon_slim, pheno_slim, vertebrate_core

axiom lost from external ontology
  • relationship loss: develops_from paraxial mesenchyme (TAO:0000942)[TAO]
  • relationship type change: part_of paraxial mesoderm (AAO:0010568) CHANGED TO: develops_from paraxial mesoderm (UBERON:0003077)[AAO]
  • relationship type change: OBO_REL:part_of trunk (TAO:0001115) CHANGED TO: develops_from trunk (UBERON:0002100)[TAO]
comment
  • When the somite becomes segmented from the segmental plate, it is composed of an epithelial sac enclosing mesenchymal somitocoel cells. Thereafter the somite differentiates into two parts, the ventro-medial mesenchymal sclerotome and the dorso-lateral epithelial dermomyotome. This change in the epithelial somite depends on surrounding tissue [PMID:15906248]
definition
  • Somites are spheres of epithelial cells that form sequentially along the anterior-posterior axis of the embryo through mesenchymal to epithelial transition of the presomitic mesoderm.
depicted by
  • http://upload.wikimedia.org/wikipedia/commons/6/64/Gray19_with_color.png
editor note
  • currently classified as an epithelial vesicle, consistent with EHDAA2 and https://github.com/obophenotype/uberon/wiki/The-neural-crest. Consider making 'somitic mesoderm' a separate term and correlate with regionalization processes. Consider moving ZFA term to 'trunk somite' as it is part of the trunk
external definition
  • Undifferentiated mesodermal components of early trunk or tail segments or metameres, derived from paraxial mesoderm; forms myotomes, sclerotomes and perhaps dermatomes. Kimmel et al, 1995.[TAO]
  • Post-cranial axial segments which form sclerotome and dermomyotome.[AAO]
has broad synonym
  • mesodermal cluster
has related synonym
  • somites
  • somitus
  • epimere
  • epimere mesoderm
  • epithelial somite
  • somitic mesoderm
homology notes
  • (...) cephalocordates and craniates belong to a group known as Somitichordata. Somitichordate synapomorphies include (1) somites (...) (reference 1); The idea that the last common ancestor of bilaterian animals (Urbilateria) was segmented has been raised recently on evidence coming from comparative molecular embryology (reference 2).[well established][VHOG]
id
  • UBERON:0002329