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Bilaminar Stage

WVSOM Class of 2012 Bilaminar Stage

QuestionAnswer
the trophoblast above the epiblast produces what new layer? why? syncytiotrophoblast, produces progesterone
all cells not becoming a part of the syncytiotrophoblast become what? cytotrophoblast
how do syncytiotrophoblast nuclei proliferate if they are amitotic? as the cytotrophoblast cells divide, they fuse with the syncytiotrophoblast to donate nuclei
the embryoblast laminates into what 3 cell layers? which two are the bilaminar layer? the amnion, epiblast, and hypoblast; bilaminary layer is the hypoblast and epiblast
what is the amnion? the thin membrane that forms along the interior of the cytotrophoblast
what cells comprise the epiblast? why is this important? high columnar cells; this is the entire fetus with the exception of the primordial germ cells
the hypoblast produces what structure? what cells is it comprised of? the yolk sac; it is comprised of small cuboidal cells
after the blastocyst embeds, what cells close the hole on the endometrial surface? fibrin coagulum
the hypoblast spreads along the inner surface of the endometrium to form what? extraembryonic endoderm
where is the primary yolk sac? bound by the extraembryonic endoderm and the hypoblast
spaces formed in the syncytiotrophoblast are called what? what is this period called? trophoblastic lacunae; lacunar stage
what is the new layer that forms between the cytotrophoblast and the extraembryonic endoderm? extraembryonic mesoderm
extraembryonic lacunae expand to form what? chorionic cavity
the extraembryonic mesoderm layer lining the yolk sac is what? splanchnic extraembryonic mesoderm
the extraembryonic mesoderm layer lining the cytotrophoblast is what? somatic extraembryonic mesoderm
what are the 3 layers of the chorion? somatic mesoderm, cytotrophoblast, and syncytiotrophoblast
what primordial structure becomes the umbilical cord? the connecting stalk
placental circulation begins to develop where? at the embryonic pole
syncytiotrophoblast erodes the endometrium endothelial lining of the maternal capillaries to produce what? sinusoids
what process has glandular secretions causing endometrium surrounding the embryo to become edematous with glycogen and lipids? the decidua reaction
what does the decidua region of the endometrium develop into? maternal component of the placenta
what is the portion of the primary yolk sac that is pinched off from the embryo? the exocoelomic cyst
increased blood flow to the lacunar spaces can produce bleeding when? 28th day of menstrual cycle
what term means to have multiple nuclei within an extended, continuous cytoplasm? synctytium
A fluid filled cavity develops between the amnion and epiblast known as what? amniotic cavity
during amniocentesis, what marker is being checked for? what might this indicate if found? alpha-fetoprotein; developmental defect
where do extraembryonic lacunae develop? extraembryonic mesoderm
after the primary yolk sac pinches off the exocoelomic cyst, what is it then called? secondary yolk sac
Created by: mhassan on 2008-08-26



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