Placenta Previa is a condition where the placenta lies low in the uterus and partially or completely covers the cervix. It is produced when the blastocyst implants close to the internal os (opening) of the cervix.
Placenta previa affects about 1 in 200 pregnant women in the third trimester of pregnancy. It is more common in women who have had one or more of the following:
- More than one child
- A cesarean birth
- Surgery on the uterus
- Twins or triplets
It causes severe, even life-threatening bleeding in the second part of pregnancy and during delivery. Other Signs and Symptoms Include: premature contractions, baby is breech, or in a transverse position
The placenta is a temporary fetal organ that begins developing from the blastocyst shortly after implantation. It plays a critical role in facilitating nutrient, gas and waste exchange between the maternal and fetal circulations. It is also an important endocrine organ producing hormones thatregulate both maternal and fetal physiology during pregnancy.
Cervix of uterus:
The cervix is the lower portion of the uterus, an organ of the female reproductive tract. It connects the vagina with the main body of the uterus.
The blastocyst is an embryonic structure formed in the early stages of development of mammals. It possesses an inner cell mass which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. The trophoblast provides nutrients to the embryo and develop into a large part of the placenta.