Hint: The blastocyst may be a structure formed within the early development of mammals. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity referred to as the blastocoel. The trophoblast gives rise to the placenta.
Blastocyst is a stage of the mammalian embryo . It is generally a form of blastula which develops from a berry-like cluster of cells. The blastocyst is composed of cells forming the outer trophectoderm, and an inner cell mass and a blastocoel.
In human blastocyst stage development occurs during the first and second week which follow the fertilization.In the case of in vitro fertilization the blastocyst culture is important generally to increase the success rate of IVF in order to get a better embryo selection after better genomic activation and endometrial receptivity.
The physical and functional separation of the inner cell mass from the trophectoderm (TE) could be a special feature of mammalian development and is the first cell lineage specification in these embryos. Following fertilization within the oviduct, the mammalian embryo undergoes a comparatively slow round of cleavages to provide an eight cell morula. Each cell of the morula, called a blastomere, increases surface contact with its neighbors in an exceedingly process called compaction.The blastocyst consists of the outer cell layer called the trophoblast and therefore the inner cell mass. The inner cell mass will form all the tissues of the embryo and differentiate into embryo proper. The trophoblast will form the placental structures.