Micromeres


Also found in: Dictionary, Medical.

Micromeres

 

the small cells that form by complete unequal cleavage of an ovum. Micromeres differ from the macromeres of the same embryo by their smaller size and yolk content. The micromeres are usually found in the animal hemisphere of the embryo (for example, in frogs), although sometimes they are located in the vegetal hemisphere (in sea urchins).