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24 Cards in this Set
- Front
- Back
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whats the name of that part of the allantois that extends anteriorly and superiorly from the developing bladder that is supposed to obliterate
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the urachus
incomplete obliteration leads to cysts or umbilical fistula |
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what does the allantois eventually become
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the median umbilical ligament
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where do you find the two kinds of extraembryonic mesoderm at week 2
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somatic (somatopleuric) mesoderm is lining the inner wall of the cytotrophoblast layer
the splanchnic (splanchnopleuric) mesoderm is lining the outer aspect of the umbilical vesicle |
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what happens to the chorionic cavity as the amnion enlarges
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it is obliterated
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when is amniocentesis usually performed
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week 14 - 16
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three layers of the chorion, week 2
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somatic extraembryonic mesoderm
cytotrophoblast syncitiotrophoblast |
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primary villi appear at the end of week 2
what is their composition |
primary chorionic villii
a core of cytotrophoblast with a syncitiotrophoblast covering |
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the secondary chorionic villi forms a sinus
what is this sinus continuous with |
the umbilicus
the veins and arteries of the umbilicus will go through that space |
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what do those syncitiotrophic spaces become
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maternal sinusoids
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what tissue do the nutrients of maternal blood diffuse across to reach the chorionic villi
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that's cytotrophoblast
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what does the endometrium become after the implantation of the blastocyst
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the decidua
theres an accumulation of glycogen and lipids in the endometrial cells |
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the decidua further differentiates
the part of the placenta up against the uterus is called the ___________ the part by the uterine space is called the ____________ the part lining the baby-free part of the uterine cavity is the ___________ |
deidua basalis- chorion frondosum
decidua capsulari - chorion laeve dedicua parietalis |
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what pregnancy test works within 24-48 hours
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EPF
Early Pregnancy Factor |
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what pregnancy test works within 2 weeks
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HCG
Human Chorionic Gonadotropin |
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when does ultrasound start to work
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3 weeks
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implantation occurs at the _________ stage
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blastocyst
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where are pygopagus conjoint twins joined
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at the lumbar/sacral area
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what determines the amount of membrane sharing in monozygous twins
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where separation of the embryo occurs
at blastomere stage, separate amnions and chorions at inner cell mass stage, different amnions and shared chorion splitting of bilaminar disc, shared everything |
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postnatal derivatives
umbilical vein |
ligamentum teres hepatis
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postnatal derivatives
umbilical arteries |
medial umbilical ligaments
the arteries carried deoxygenated blood back to the maternal sinusoids, in the baby they tie in off the venous system (internal iliac v) |
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postnatal derivatives
ductus arteriosis |
ligamentum arteriosum
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postnatal derivatives
ductus venosus |
ligamentum venosum
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postnatal derivatives
foramen ovale |
fossa ovalis
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postnatal derivatives
allantois |
median umbilical ligament
(obliterated urachus) |
