Implantation (embryology)
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Implantation (embryology)
Implantation in embryology refers to the process in which a fertilized egg (or blastocyst) adheres to the wall of the uterus or womb. This process is crucial for the initiation of pregnancy as it establishes a connection between the mother and the developing embryo.
Process
Implantation begins approximately one week after fertilization. The blastocyst, which has been moving through the fallopian tube, enters the uterus. Here, it adheres to the uterine wall in a process facilitated by various hormones and cytokines. The blastocyst then burrows into the uterine wall, embedding itself in the endometrium. This process is known as "invasion".
Role in Pregnancy
Successful implantation is a critical step in establishing a healthy pregnancy. It allows the embryo to receive nutrients and oxygen from the mother, which are essential for its growth and development. If implantation does not occur, the fertilized egg will be expelled from the body during the woman's next menstrual cycle.
Factors Influencing Implantation
Several factors can influence the success of implantation. These include the health and age of the woman's eggs, the quality of the man's sperm, and the health of the woman's uterus. Certain medical conditions, such as endometriosis or polycystic ovary syndrome (PCOS), can also affect implantation.
Complications
Complications can arise if the blastocyst implants outside the uterus, such as in the fallopian tube. This is known as an ectopic pregnancy and is a serious medical condition that requires immediate treatment.
See Also
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