decidua nomenclature Flashcards
what is the stroma?
under the epithelium of the uterus
what initiates the decidual reaction in the stroma
blastocyst implantation
what do stromal cells accumulate after implantation occurs?
lipid and glygogen
how does the stroma physically change?
it thickens. blood vessels invade the area making it highly vascularized.
what is the endometrium called?
the decidua
what three areas does the decidua have relative to implantation site and growing embryo?
a. decidua basalis:
b. decidua capsularis
c. decidua parietalis
Decidua basalis
the area of thickened decidua next to the embryonic pole or point of implantation. this will form the maternal part of the placenta.
dedcidua capsularis
the area of decidua next to the abembryonic pole. This decidua becomes thin as the embryo and its extraembryonic cavities push out into the uterine cavity.
decidua parietalis
what is not basaiis or capsularis
what happens to the decidua capsularis during months 4-5?
it is eliminated by being pushed next to the decidua parietalis, closing off the uterine cavity.
what do tertiary villi do once decidua capsularis is eliminated?
they form from the embryonic around to the abembryonic pole. by the end of the fourth week, tertialry villi cover the entire chorion. As the embryo grows into the uterine cavity, villi on the chorion at the abembryonic pole are compressed against the decidua capsularis.
what happens to the villi that are compressed against the decidua capsularis? what does this form?
the villi atrophy and leave a smooth chorion again, which is the chorion laeve.
what is the chorion frondosum?
the chorionic region at the embryonic pole still retaining villi. It is the fetal contribution to the placenta.
How is the placenta derived? what is it composed of?
it is derived fetally and maternally. It is composed of:
A. basal plate
B. chorionic plate
basal plate
maternal layer of decidual basalis and cytotrophoblast
