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The blastocyst is a structure formed in the early embryonic development of mammals.It possesses an inner cell mass (ICM) also known as the embryoblast which subsequently forms the embryo, and an outer layer of trophoblast cells called the trophectoderm.
The red portion is the primary blast area which is the zone where immediate blast wave injuries occur. The secondary blast area is where injuries caused by missiles from the blast. The tertiary blast area are injuries caused by being thrown against a solid object.
Trophoblasts are specialized cells of the placenta that play an important role in embryo implantation and interaction with the decidualized maternal uterus. [5] The core of placental villi contain mesenchymal cells and placental blood vessels that are directly connected to the fetus’ circulation via the umbilical cord.
The blastula (from Greek βλαστός (blastos meaning sprout)) is a hollow sphere of cells known as blastomeres surrounding an inner fluid-filled cavity called the blastocoel. [1] [2] Embryonic development begins with a sperm fertilizing an egg cell to become a zygote, which undergoes many cleavages to develop into a ball of cells called a ...
In bioinformatics, BLAST (basic local alignment search tool) [3] is an algorithm and program for comparing primary biological sequence information, such as the amino-acid sequences of proteins or the nucleotides of DNA and/or RNA sequences.
The inner cell mass (ICM) or embryoblast (known as the pluriblast in marsupials) is a structure in the early development of an embryo.It is the mass of cells inside the blastocyst that will eventually give rise to the definitive structures of the fetus.
Diagram of stages of developing blastocyst in the human until implantation. There are two stages of migration involved in implantation, the first is the migration of the zygote, and the second is the migration of the trophoblast. [13] Fertilization of the oocyte, takes place in the ampulla of the fallopian tube.
The division of blastomeres from the zygote allows a single fertile cell to continue to cleave and differentiate until a blastocyst forms. The differentiation of the blastomere allows for the development of two distinct cell populations: the inner cell mass, which becomes the precursor to the embryo, and the trophectoderm, which becomes the precursor to the placenta.