Implantation

Implantation is a process of attachment of fertilized egg to the uterine lining, also known as the endometrium, in response to the hormonal changes that help in the growth of the endometrium. After the successful event of fertilization, the zygote starts dividing mitotically and forms a 2-cell stage and proceeds to divide mitotically to finally form an 8-16-cell stage known as Morula. Furthermore, the morula grows to form a blastocyst. 

The blastomere in the blastocyst gets arranged to form an outer layer known as trophoblast and an inner layer called as inner cell mass. The trophoblast layer then attaches to the endometrium. The endometrium, in response to the several hormonal changes that take place during the menstrual cycle, grows and provides a nourishing platform for the blastocyte to get attached to the endometrium.  

Factors affecting the process of Implantation

Implantation is a very delicate process which gets affected by a variety of factors; i.e., hormonal imbalance is one of the main factors that make implantation more difficult. The increased level of progesterone may lead to the abandonment of implantation. Furthermore, the structural abnormalities in the uterus can make it more difficult for the blastocyst to implant. 

Fertilization and implantation are the 2 important events in human reproduction, which is the biological process of producing new individuals from a union of male and female gametes. This complex process involves the fusion of gametes, the development of a zygote, and the growth and differentiation of the embryo, which ultimately leads to the formation of a fetus within the uterus.