Langman Chp 4 Flashcards
(10 cards)
What is decidualization?
Transformation of endometrial stromal cells into decidual cells under progesterone influence.
Name the three regions of the decidua.
Decidua basalis, decidua capsularis, decidua parietalis.
What are the main stages of implantation?
Apposition, adhesion, and invasion.
Which trophoblast layer invades the endometrium?
Syncytiotrophoblast.
What is an ectopic pregnancy?
Implantation of the embryo outside the uterine cavity.
What characterizes a complete molar pregnancy?
Absence of embryonic tissue; typically diploid with paternal origin.
What forms the bilaminar embryonic disc?
Epiblast and hypoblast layers.
What is the role of the amniotic cavity?
Provides a fluid-filled environment for the developing embryo.
How is the chorionic sac formed?
From the chorion, which includes extraembryonic mesoderm and trophoblast layers.
What initiates uteroplacental circulation?
Formation of lacunar networks and erosion of maternal capillaries by syncytiotrophoblasts.
