Conception And Prenatal Development Flashcards
somatic cells are produced by :
mitosis
gametogenesis occurs :
in meiosis
what is zygote?
fertilization of ovum
what is the duration of pre-embryonic period ?
0-2 weeks
what is a morula?
12-16 cells of conceptus , resembles a mullberry
what is a blastocyst?
a fluid filled sac of cells within an inner cell mass
inner cell mass :
embryoblast , fetus
trophoblast fetal
membranes and placenta
what is a decidua?
the endometrium
where is the implantation location?
the upper uterus,
why the upper uterus?
rich blood supply, thick uterine lining, limits blood loss after birth
what produces HCG?
the zygote
what does the corpus luteum do?
produces progestrone and estrogen until the placenta takes over
waht is the chorionic villi?
fetal side of placenta
decidua basalis :
maternal of side of placenta
what is the duration od the embryonic period ?
3rd to the 8th week
what happens to during the embryonic period ?
basic body structures or major body organs are completed ,
what does the mesoderm form?
bone, muscle , heart and blood vessels
what does the endoderm form?
mucus membrane and glands
what is the duration of the fetal period ?
9th week to birth
weeks 9-12
gentilia formed
weeks 13-16
Multi para may feel first movements (quickening)
weeks 17-20
“butterflies”
weeks 25-28
fetus more likely to survive extra uterine
