Endometrium in Pregnancy
Endometrium is the lining of uterus which nurtures the embryo and helps implantation. This lining of the body of the uterus, is composed of numerous glands embedded within tissue. During a woman’s reproductive years the superficial layers of the endometrium moves through cycles of changes of development and destruction.
Implantation is referred to the stage of pregnancy at which the embryo adheres to the wall of the uterus. It helps the embryo to grow by receiving nutrients from the mother. Implantation is initiated when the blastocyst comes into contact with the uterine wall. Certain molecules are involved in bringing embryo and endometrium together and attachment in embryo implantation. The embryo produces cytokines and growth factors and receptors for endometrial signals.
Implantation of a fertilized ovum is most likely to occur around 6 – 9 days after ovulation. It falls around day 21 of a regular menstruation cycle. In irregular cycles, it is difficult to predict. During the female fertile age, there is an average chance of pregnancy of approximately 15% per cycle.
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