Morula vs. Blastula

(embryology) A spherical mass of blastomeres that forms following the splitting of a zygote; it becomes the blastula

The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; - called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation.

a solid mass of blastomeres that forms when the zygote splits; develops into the blastula

A morula (Latin, morus: mulberry) is an early-stage embryo consisting of 16 cells (called blastomeres) in a solid ball contained within the zona pellucida.A morula is distinct from a blastocyst in that a morula (3–4 days after fertilization) is a mass of 16 totipotent cells in a spherical shape whereas a blastocyst (4–5 days after fertilization) has a cavity inside the zona pellucida along with an inner cell mass. A morula, if untouched and allowed to remain implanted, will eventually develop into a blastocyst.The morula is produced by a series of cleavage divisions of the early embryo, starting with the single-celled zygote.

(embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.

That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

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) implantation in the wall of the uterus occurs