First Trimester Flashcards
(43 cards)
the age of pregnancy calculated from 1st day of LMP
gestational age
the age of fetus calculated from fertilization;
2 weeks younger than gestational
conceptual age
through TVS the pregnancy can be identified _____ weeks earlier
1-2
weeks 2-8 of GA
embryonic period
more than 10 wks of gestation is known as
fetal period
a fertilized ovum by sperm is called a
zygote
when the zygote divides into two cells it is called a
blastomere; (cleavage ongoing cell division)
when a blastomere produces 12-16 cells it is called a
morula
product of conception is called
blastocyst
the blastocyst consists of the outer cell mass _____ and inner cell mass _______
trophoblast and embryoblast
the blastocyst will embed itself in the
secretory endometrium (thickening of uterine lining)
2 weeks after fertilization what develops
the bilaminar disc and the trilaminar disc
the _________ forms within the blastocyst. from two germ layers ______________.
bilaminar embryonic disc, endoderm (hypoblast) and ectoderm (epiblast).
the bilaminar disc turns into the __________ disc which holds the ___________________.
trilaminar disc, ectoderm, mesoderm and endoderm
what two cavities develop from the inner cell mass
amnion and primary yolk sac
trophoblasts differentiate into
cytotophoblast and syncytiotrophoblast
primary yolk sac and amniotic cavity was formed by the
embryoblast
cytotrophoblast and syncytiotrophoblast were formed by the
trophoblast
hCG produced by day 28
maintains the corpus luteum (progesterone) in order to prevent menstruation and maintain endometrial lining
blastocyst implantation has to do with the _____of the uterine cavity
lining
transformed endometrium of pregnancy is called
decidua
there are three types of decidua
basalis, capsularis, vera/parietalis
the endometrium lining the rest of the uterine cavity is called the
decidua vera/parietalis
the blastocyst is completely covered by the
decidua capsularis
