Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Placebo-controlled: A term used to describe a method of research in which an inactive substance (a placebo) is given to one group of participants, while the treatment (usually a drug or vaccine) being tested is given to another group. The results obtained in the two groups are then compared to see i...
Placenta: A temporary organ joining the mother and
fetus, the placenta transfers oxygen and nutrients from the mother to
the fetus, and permits the release of carbon dioxide and waste
products from the fetus. It is roughly disk-shaped, and at full term
measures about seven inches in diameter and...
Placenta accreta: The abnormal adherence of the chorionic villi (vascular fingers of the chorion, a part of the placenta) to the myometrium (the muscle of the uterus), . Normally there is tissue intervening between the chorionic villi and the myometrium but in placenta accreta, these vascular proce...
Placenta percreta: A placenta that invades the
uterine wall. In placenta percreta, the vascular processes of the
chorion (the chorionic villi), a fetal membrane that enters into the
formation of the placenta, may invade the full thickness of the
myometrium. This can cause an incomplete rupture o...
Placenta praevia: A placenta implanted near the
outlet of the uterus, so that at the time of delivery the placenta
precedes the baby. Placenta praevia can cause painless bleeding in
the last third of pregnancy, and may be a reason for a C-section.
Also known as low placenta....
Placenta previa: Location of the placenta in the lower part of the
uterus (womb) so that the placenta partially or completely covers the cervix. ...
Placenta, accessory: See: Accessory placenta....
Placenta, low: Location of the placenta in the lower part of the
uterus (womb) so that the placenta partially or completely covers the cervix. Also known
as a placenta previa....
Placenta, succenturiate: An extra placenta separate
from the main placenta. In anatomy "succenturiate" means accessory to an organ.
In this case, a succenturiate placenta is an accessory placenta....
Placenta, supernumerary: A succenturiate or accessory
Placental: Pertaining to the placenta, the organ joining the mother and fetus during pregnancy....
Placental BMP: See: MIC-1....
Placental bone morphogenetic protein
Placental bone morphogenetic protein: See: MIC-1....
Placental chorioangioma: A benign vascular (blood vessel) tumor of the placenta (afterbirth).
Large chorioangiomas cause complications including excess amniotic fluid (polyhydramnios), maternal and fetal clotting problems (coagulopathies), premature delivery, toxemia, fetal heart failure, and hydrop...
Placental dystocia: Difficulty delivering the placenta (the afterbirth). Dystocia comes from the Greek "dys" meaning "difficult, painful,
disordered, abnormal" + "tokos" meaning "birth."...