somite

https://doi.org/10.1351/goldbook.11231

One of bilaterally paired, segmented masses of mesodermal tissue lying along the notochord that gives rise to the vertebrae and associated muscle and connective tissue.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 806 [Terms] [Paper]