Final answer:
Three types of abnormal placental implantations are Placenta Previa, where the placenta partially or completely covers the cervix; Placental Abruption, where the placenta detaches prematurely; and Ectopic Pregnancy, where the embryo implants outside the uterus.
Step-by-step explanation:
Three types of abnormal placental implantations are:
- Placenta Previa: This occurs when the placenta partially or completely covers the cervix. It can lead to antepartum hemorrhage and is the leading cause of vaginal bleeding after week 24 of pregnancy but prior to childbirth.
- Placental Abruption: This condition happens when the placenta detaches from the uterine wall before delivery, which can be dangerous for both mother and baby due to the risk of severe bleeding.
- Ectopic Pregnancy: This is when an embryo implants outside the uterus, often in the fallopian tubes, but it can also occur in the abdomen or ovary. It cannot proceed as a normal pregnancy and is a medical emergency.
The normal location of the placenta is within the body of the uterus at a site that supports fetal growth and development. However, when these implantation abnormalities occur, they can lead to significant complications during pregnancy.