Noun(1) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization(2) early stage of an embryo produced by cleavage of an ovum(3) a liquid-filled sphere whose wall is composed of a single layer of cells(4) during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs [also: blastulae (pl)]
Noun(1) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization(2) early stage of an embryo produced by cleavage of an ovum(3) a liquid-filled sphere whose wall is composed of a single layer of cells(4) during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs [also: blastulae (pl)]
(1) A lot of research has gone into answering that, and determining the earliest stage at which the blastula breaks symmetry.(2) Gastrulation in its broadest sense is the reorganization of the cells of the blastula to form a multilayered embryo, the gastrula.(3) How is it possible that in the past six months, this microscopic blastula has transformed into a being with its own organs, spinal cord and brain?(4) With time, cells gradually become determined, so that similar cells taken from later-stage blastulas and early gastrulas develop according to their fate at the time of transplantation.(5) Embryos treated at lower concentrations showed delayed gastrulation and those treated at higher concentrations developed to blastulae having abnormal blastocoels with excess cells.
