/ˌmʌɪə(ʊ)ˈsɛptə/, U.S. /ˌmaɪoʊˈsɛptə/, (irregular) myoseptae Brit. /ˌmʌɪə(ʊ)ˈsɛptiː/, U.S. /ˌmaɪoʊˈsɛpti/.myoseptumn.
/ˌmʌɪə(ʊ)ˈsɛptəm/, U.S. /ˌmaɪoʊˈsɛptəm//ˌmʌɪə(ʊ)ˈsɛptə/, U.S. /ˌmaɪoʊˈsɛptə/, (irregular) myoseptae Brit. /ˌmʌɪə(ʊ)ˈsɛptiː/, U.S. /ˌmaɪoʊˈsɛpti/. Zoology and Anatomy.
A membrane which separates adjacent myomeres in lower vertebrates and in the embryos of higher vertebrates.
ΚΠ
1890 Amer. Naturalist 24 481 Hatschek farther concludes that [the somatic portion of the vertebrate skeleton]..should be further subdivided into axial, dermal, and septal portions, the latter embracing the portions arising in the myosepta.
1903 Rep. Brit. Assoc. Advancem. Sci. 1902 655 Each bundle of fibrils is seen to be contained in a sheath of protoplasm containing a nucleus at one side, the whole forming a somewhat cylindrical ‘cell’ stretching from the one myoseptum to the other.
1930 Philos. Trans. (Royal Soc.) B. 218 418 After the liberation of sclerotomic cells the somites should be called myotomes and the septa between them myosepta.
1974 D. Webster & M. Webster Compar. Vertebr. Morphol. vii. 130 In anurans the transverse myoseptae are lost and long, cablelike muscles extend the length of the trunk.
1988 Zool. Jrnl. Linn. Soc. 92 387 In some cases it was necessary to remove the skin in order to obtain a clear view of the myosepta.
This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022).
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n.1890