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17 Cards in this Set
- Front
- Back
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Fetal Membrane are a collective group which include what 4 things?
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Chorion = placenta
Amnion => surrounds the fetus Yolk Sac => part of GI tubes Allantois => cranial outlet of bladder (rudimentary) |
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A portion of it is incorporated into the GI tubes (the remainder is rudimentary in humans)
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yolk sac
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what gives rise to the placenta
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chorion
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During the SECOND MONTH, the villli at the Embryonic Pole expand and proliferate forming a bush array of villi called the ?
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Chorion Frondosum
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The villi over the AEMBRYONIC POLE degenerate, forming a smooth surface known as the ?
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Chorion Laeve
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Endometrial contribution--
The endometrial cells have accumulated lipids and glycogen, and are now called ? |
Decidua
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The decidua underlying the Chorion Frondosum is known as the ?
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Decidua Basalis
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A layer of decidual cells tightly adherent to the underlying chorion is known as the ?
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Decidual Plate
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The decidua atop the AEMBRYONIC pole is known as the ?
(opening of cervix) |
Decidua capsularis
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The decidua not in intimate contact with the developing embryo is the ?
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Decidua Parietalis
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As the embryo develops and the chorion expands, the ? degenerates
and the ? fuses with ? obliterating the uterus lumen |
decidua capsularis (degenerates)
decidua laeve decidua parietalis fuse together!!! |
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proliferating ? surrounded by ? form PRIMARY VILLI
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cytotrophoblasts
syncytiotrophoblasts |
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What forms a SECONDARY VILLI?
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extraembryonic mesoderm
penetrates the cytotrophoblastic core of the primary villi (cytotrophoblast + syncytiotrophoblasts) |
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What forms a TERTIARY VILLI?
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development of BLOOD VESSELS in secondary villi
secondary villi (extraembryonic mesoderm + cytotroph + syncytotroph) |
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Villi extending from the chorionic plate and anchoring to the cytotrophoblastic shell are termed ?
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anchoring villi
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? are lined by syncytiotrophoblasts and bordered by anchoring villi, the chorionic plate, and the cytotrophoblastic shell.
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Intervillous spaces
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During the 4th month--
there is loss of ? and ? in the branching villi, approximating the endothelial wall of the capillary and the syncytium. |
Cytotrophoblasts
Connective Tissue |
