The second week Flashcards
What are the two parts of the blastocyst ?
embryoblast and the trophoblast
What are the two parts of the embryoblast
hypoblast and the epiblast
what are the two parts of the trophoblast
cytotrophoblast and the syncytiotrophoblast
at the end of the second week what are the two cavities that are formed
amnionic cavity and the yolk sac
the layer of the hypoblast is now called______________ and the cavity is now called the ______________-.
extraembryonic endoderm, primary yolk sac
What is the lining of he embryoblast called ?
heuser’s membrane
What is secreted between the extraembryonic endoderm and the cytotrophoblast ?
extraembryonic reticulum
what are the two layers of the extraembryonic mesoderm
somatopleuric if contact with trophoblast and splanchnopleuric if contact with the embryo
what does the connecting stalk become
unbilical cord
what does the syncytiotrophoblast secrete
HcG
what happens on day 9?
the uteronplacental circulation begins to form trophoblastic lacunae and the maternal sinusoids
what is the chroion composed of ?
cytotrophoblasts, synctiotrophoblasts and extraembryonic mesoderm
what does a hydatidiform mole result from ?
fertilization of an empty oocyte, typicaly secretes high levels of HcG
what does polyhydramnios mean ?
too much amnionic gluid, could be the result from a GI problem
what does oligohydramnios mean
too little amnionic fluid and could be suffering from a kidney problem
what are the layers materials must transverse if exchanging materials from mother to fetus
synctiotrophoblast, cytotrophoblast, loos CT of the villlus and endothelium of the villus capilarries
what is a complete mole ?
fertilization of an empty oocyte with duplication, or fertilization of an empty oocyte by two sperms
What is placental previa
Implantation in the internal os of the uterus near cervix that causes significant bleeding
what are partial moles
result from a poorly developed embryo and are always triploid or XXX, XXY, or XYY
somatopleuric
lines the cytotrophoblast and helps from the chorion
splanchnopleuric
contact with germ disc and contributes to the umbilical cord; the laer around the yolk sac and amnion cease to develop further and are unimportant
what is the chorion composed of
somatopleuric layer, cytotrophoblast, syncytiotrophoblast
neuroenteric canal
connection between the amniotic cavity and the yolk sac
