Construction is a general term meaning the art and science to form objects, systems, or organizations, and comes from Latin constructionem (from com-together and struere to pile up) and Old French construction. Construction is used as a verb: the act of building, and a noun: how a building was built, the nature of its structure.
Definition of Placenta accreta. Placenta accreta: The abnormal adherence of the chorion of the placenta to the myometrium of the uterus. Normally there is tissue intervening between the chorionic villi and the myometrium, but in 'placenta accreta, the vascular processes of the chorion grow directly in the myometrium. Placenta accreta can progress into placenta percreta. Search MedTerms:
Placenta previa is a pregnancy problem in which the placenta blocks the cervix. The placenta is a round, flat organ that forms on the inside wall of the uterus soon after conception. During pregnancy, it gives the baby food and oxygen from the mother.In a normal pregnancy, the placenta is attached high up in the uterus, away from the cervix. In placenta previa, the placenta forms low in the uterus and covers all or part of the cervix.If placenta previa is present during labor and delivery, it can cause problems for both mother and baby. 1  The mother may lose a lot of blood, which can be dangerous for both her and her baby.he placenta is a round, flat organ that forms on the inside wall of the uterus soon after conception. During pregnancy, it gives the baby food and oxygen from the mother. In a normal pregnancy, the placenta is attached high up in the uterus, away from the cervix.