Process of Conception Flashcards
Fertilized ovum is called
Zygote
How many days does the zygote stays in the fallopian tube?
3 days
When there are already 16 blastomeres, it is termed?
Morula
How many days does the blastocysts stay in the uterus
3-4 days
Fingerlike projections that surrounds the blastocyst
Trophoblast
Other term for implantation
Nidation
________ are the one’s which implant high on the anterior
or posterior surface of the uterus
trophoblast
When a cavity is formed
in the morula, it is termed as ___________
blastocyst
How many blastomere does it take for it to turn into morula?
16 blastomeres
It is the contact between the
trophoblast and the uterine endothelium.
Implantation/nidation
3 processes that occur in implantation
Apposition
Adhesion
Invasion
Once implantation has taken place,
endometrium is called ____________
Decidua
Divisions of the Decidua
deciduas basalis
deciduas capsularies
deciduas vera/parietalis
inner layer which is present as early as 12 days gestation and appears to be
functional early in pregnancy but then disappears between the 20th and 24th
week.
Cytotrophoblast/Langhan’s Layer
outer layer containing fingerlike projections called chorionic villi which gives
rise to fetal membranes that arise from the zygote
Syncytiotrophoblast/Syncitial Layer
outer membrane, together with deciduas basalis gives rise to
placenta which starts to form at 8th weeks gestational age
chorion
inner layer which gives rise to umbilical cord/funis and amniotic fluid/ bag of water (BOW)
amnion
the lifeline that links the embryo/fetus and the placenta
contains 2 umbilical arteries that returns deoxygenated
blood to the placenta and 1 umbilical vein that carries
oxygenated blood to the fetus
Umbilical cord/funis
amniotic fluid begins to form at ___ to ___ weeks gestation
11-15th
a pale, clear, straw colored albuminous fluid in which
the baby floats
amniotic fluid
specific gravity of amniotic fluid
1.007 to 1.025
ph of BOW
7.0 to 7.25
near term, is clear, colorless containing little white,
peaks of vernix caseosa and other solid particles
BOW
BOW is produces at a rate of _______ in 24 hrs and fetus swallows it at an equally rapid rate of ____ ml/24 hrs
500 ml, 500
by ____ lunar month, _____ is added to the amount of amniotic fluid derive chiefly from maternal serum and
fetal urine
4th urine
shields the fetus against blows or pressures on the
mother’s abdomen
BOW
protects the fetus against sudden changes in
temperature since liquid changes temperature more
slowly than air
BOW
protects the fetus against infections
BOW
removal of amniotic fluid to diagnose
chromosomal abnormalities
Amniocentesis
stained amniotic fluid in non-breech
presentation is a sign of fetal distress
Meconium
Baby’s first poop
Meconium
arises out of trophoblastic tissues
chorion together with deciduas basalis gives rise to the placenta which starts to form at 8th week gestational age
Placentation
the placenta develops into ___ to ____ lobes or cotyledons/each functioning unit and each cotyledons are separated by fenestrated septa
15-20
nutrients pass to the fetus via the placenta by means of ______ through
placental tissues
diffusion
feto-placental circulation takes place by ___________ via the umbilical
arteries and umbilical vein
selective osmosis
Waste products are excreted through the ________. It is the mother’s liver
that detoxifies the waste products of the fetus
placenta
orders the corpus luteum to keep on producing Estrogen and Progesterone that is why there is amenorrhea during pregnancy
hCG (Human Chorionic Gonadotropin)
promotes growth of the mammary glands necessary for lactation
hPL (Human Placental Lactogen)
or hCS (Human Chorionic Somatotrophin)
