Early Embryonic Development definitions Flashcards
Early Embryonic Development definitions
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Cleavage
A series of rapid mitotic divisions post-conception, increasing cell number while decreasing cell size. Blastomeres
Genetically identical cells produced during cleavage, serving as building blocks for the conceptus. Morula
An early stage embryo with a solid ball of cells, resembling a mulberry, entering the uterus. Blastocyst
A structure formed around days 4-5 post-conception, consisting of an embryoblast and trophoblast. Embryoblast
The inner cell cluster of a blastocyst that will develop into the embryo. Trophoblast
The outer cell layer of a blastocyst that will form the placenta. Zona Pellucida
A protective layer surrounding the conceptus, similar to an eggshell, dissolving by day 4-5. Mitotic Divisions
Cell divisions resulting in genetically identical cells, crucial during early embryonic development. Uterine Tube
The passage through which the conceptus travels before entering the uterine cavity. Surface-to-Volume Ratio
A factor that increases nutrient absorption efficiency as cell size decreases during cleavage. Conceptus
The developing embryo and its associated membranes during early pregnancy stages. Implantation
The process beginning around day 6-7 when the blastocyst contacts the uterine wall.
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