Implantation of cell cleavage type in embryo shown in photograph below occurs on which day after fertilization ?
Cell cleavage type in embryo shown in photograph above represents Blastocyst. Implantation of blastocyst occurs on 6th day after fertilization.
In the human, trophoblastic cells over the embryoblast pole begin to penetrate between the epithelial cells of the uterine mucosa on about the 6th day
Implantation: The second week of human development is concerned with the process of implantation and the differentiation of the blastocyst into early embryonic and placental forming structures.
- Implantation commences about day 6
- Adplantation – begins with initial adhesion to the uterine epithelium (blastocyst then slows in motility, “rolls” on surface, aligns with the inner cell mass closest to the epithelium and stops)
- Implantation – migration of the blastocyst into the uterine epithelium, process complete by about day 9
- Coagulation plug – left where the blastocyst has entered the uterine wall day 12
- Normal Implantation Sites – in uterine wall superior, posterior, lateral.