First Trimester Flashcards
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
