Macromeres

Macromeres

 

the large cells formed by complete unequal cleavage of an egg (for example, in the frog). Macromeres differ from micromeres of the same embryo in their greater size and their high content of yolk and cytoplasm.

References in periodicals archive ?
3D) and gave rise to micromeres and macromeres. The cleavage was total and spiraled, and no polar lobes were observed.
Asi, reconocen las series Macromeres, Aulacothelae y Glanduliferae.
(6) M k Cladophoropsis macromeres M a,c,e,k,m Taylor (6-8,14,17,25,35,40) C.
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.
Gray Phyllodictyon anastomosans (Harvey) Kraft & Wynne (1; C; L) Phyllodictyon pulcherrimum Gray (C; NE) Familia Siphonocladaceae Chamaedoris Montagne, 1842 Chamaedoris peniculum (Ellis & Solander) Kuntze (S y C; L y A) Cladophoropsis B0rgesen 1905 Cladophoropsis macromeres W.
Similar to the current study, dominant species reported included Sargassum polycarpum, Turbinaria tricostata, and Cladophoropsis macromeres.
If the proliferation rates of micro- and macromeres are equal, then all blastomeres divide synchronously, mesoderm induction occurs during the interval between the 32- and the 64-cell stage, and the mesentoblast is formed at the transition to the 64-cell stage.
At this stage, the blastomeres divided unequally, creating cells of various sizes, including macromeres and micromeres (Fig.
The first two cleavages were equal and the third unequal, producing four micromeres and four macromeres at the animal and vegetal poles, respectively (Fig.
4C), with 4 cells of macromeres at the vegetal pole (lower hemisphere) and 4 cells of micromeres at the animal pole (upper hemisphere).
The macromeres 4A, 4B, and 4C contribute to the stomach, the left and right midgut lobes, the style sac, and possibly the salivary glands.