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ECB-STAGE-20

Name: 32-cell stage

ECAO ID: 0000210

Definition: "An embryo that is composed of 32 cells and is surrounded by a fertilization envelope. Note for euechinoid indirect developers: The micromeres have undergone a fifth cleavage (and this has occurred prior to a subsequent division of the other cells). This cleavage was unequal and equatorial, thereby producing four large micromeres and four small micromeres, the smallest cells still marking the vegetal pole."


Preceded By: 28-cell stage Succeeded By: 56-cell stage