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20 Cards in this Set
- Front
- Back
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Inner cell mass divides into 2 layers |
Epiblast -》 Embryo Hypoblast -》 Yolk Sac |
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What happens @ embryonic pole |
Implantation Blastocyst contacts uterine Matrix |
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Cytotrophoblast |
Inner layer of trophoblast Interior to the the synctiotrophoblast |
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Synctiotrophoblast |
Digest the uterine matrix starting @ Day 7 |
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What happens during day 8 |
Synctiotrophoblast continues to expand @ embryonic pole amniotic cavity forms - some epiblasts detached-》 roof of amniotic cavity = Amnioblasts |
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What happens during day 9 |
Implantation completed - coagulation plug = scar at location Amniotic cavity fully formed Some cells of hypoblast line the trophoblastic cavity -》 Form yolk sac (vitelline sac) Synctiotrophoblast continues to expand -》 forms trophoblastic lacunae (fluid filled cavities, feed embryo and remove waste) |
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Function of Trophoblastic Lacunae @ day 9 and day 13 |
Feed embryo and remove waste Filled with maternal blood |
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What happens days 12-13 |
The synctiotrophoblast expansion-》 merges with maternal capillaries -》 Trophoblastic Lacunae fill with maternal blood Formation of Extra-embryonic mesoderm -》 Surrounds the embryo, lines the Cytotrophoblast Separation of the primary yolk sac from the cytotrphoblast =》 chorionic cavity Second wave of Differentiation-》 Definitive yolk sac Proliferation of the extra embryonic mesoderm @ embryonic pole -》 suspends Embryo in the choorionic cavity |
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Extra-embryonic mesoderm |
Lines the cytotrphoblast Then proliferated and suspension the embryo in the chorionic cavity |
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Day 14 ( 2 weeks) Rules of 2 |
2 weeks 2 germ layers - Hypoblast and Epiblast 2 embryonic cavities - Amniotic Cavity, Yolk sac (Vitelline cavity) 2 components to trophoblast- Cytotrophoblast and Synctiotrophoblast |
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Formation of chorionic villi... 3 stages |
Primary stem villus - Cytotrophoblast invades Synctiotrophoblast Secondary Stem villi - Extra-embryonic mesoderm invades primary stem villi Tertiary Stem Villi - Mesoderm differentiates into CT and B.V.s connecting w/ those in embryo Uteroplacental circulation established @ Day 21 |
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2 parts of placenta |
Chorion frondosum - embryonic component Decidua basalis - maternal |
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Chroion frondosum |
@embryonic pole Embryonic contribution to the placenta |
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Decidua basalis |
Maternal contribution to the placenta |
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Implantation gone wrong |
Ectopic pregnancy Placenta: Accreta - Deep implantation Placenta Percenta - very deep implantation Placenta previa - low implantation |
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Placenta Previa |
Low implantation |
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Placenta Percreta |
Deep implantation Chorioonic villi -》 fully into Myometrium |
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Placenta accreta |
Deep implantation reaches Myometrium |
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Causes of ectopic pregnancy |
Infection - Fallopian tube salpingitis Scarring - surgery in pelbis/ tubes Smoking IVF Congenital Endometriosis |
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Endometriosis |
Ectopic fragments of uterine mucosa |
