That stage in the development of the ovum where exterior cells of the morula be defined and form the blastoderm
- very early phase of an embryo created by cleavage of an ovum; a liquid-filled world whoever wall surface is composed of a single level of cells; with this phase (about eight times after fertilization) implantation into the wall regarding the womb happens
- That phase inside growth of the ovum in which the exterior cells of morula be a little more defined and form the blastoderm.
embryonic condition, 1875, contemporary Latin, from Greek blastos "sprout, germ" + diminutive ending -ula.
(letter.) That stage in the improvement the ovum where external cells of morula are more defined and form the blastoderm.
When the blastula is oval and freeswimming the inner mass is formed by unipolar immigration from the hinder pole.