mesomere


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mes·o·mere

 (mĕz′ə-mîr′, mĕs′-)
n.
1. A blastomere of intermediate size, larger than a micromere but smaller than a macromere.
2. The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.

mesomere

(ˈmɛsəʊˌmɪə)
n
(Physiology) a blastomere of medium size that is formed by certain types of cleavage

mes•o•mere

(ˈmɛz əˌmɪər, ˈmɛs-, ˈmi zə-, -sə-)

n.
1. a blastomere of intermediate size between a micromere and a macromere.
2. the intermediate zone of the mesoderm.
[1900–05]
Translations
mésomère
References in periodicals archive ?
rosaceus follows the typical pattern for echinoids with planktotrophic larvae, beginning with three equal cleavages followed by the formation of mesomeres, macromeres, and micromeres at the 16-cell stage (Fig.
Furthermore, only a presumptive ectodermal region derived from eight mesomeres (animal cap) isolated from 16-cell staged embryos formed wrinkles (data not shown).
In embryos of many sea urchin species, A-V polarity is evidenced by the unequal sizes of blastomeres of the 16-cell embryo, which consists of tiers of eight mesomeres, four macromeres, and four micromeres.