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What primarily comprises the maternal part of the placenta?
What primarily comprises the maternal part of the placenta?
By the end of the fourth month of pregnancy, what happens to the decidua basalis?
By the end of the fourth month of pregnancy, what happens to the decidua basalis?
What illustrates the interaction between the fetal part of the placenta and the maternal part?
What illustrates the interaction between the fetal part of the placenta and the maternal part?
What is the main role of the fetal placental circulation?
What is the main role of the fetal placental circulation?
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Which characteristic defines the decidua basalis in relation to the placenta?
Which characteristic defines the decidua basalis in relation to the placenta?
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What is the name of the bushy part of the chorionic sac that increases in number and size during placental development?
What is the name of the bushy part of the chorionic sac that increases in number and size during placental development?
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Which structure contains maternal blood and is closely associated with the chorionic villi?
Which structure contains maternal blood and is closely associated with the chorionic villi?
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Which part of the placenta is formed by the villous chorion?
Which part of the placenta is formed by the villous chorion?
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What occurs to the villi associated with the decidua basalis during placental development?
What occurs to the villi associated with the decidua basalis during placental development?
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What is the primary function of the chorionic villi during pregnancy?
What is the primary function of the chorionic villi during pregnancy?
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Which of the following statements is true regarding the maternal part of the placenta?
Which of the following statements is true regarding the maternal part of the placenta?
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During placental development, which feature increases in the villous chorion?
During placental development, which feature increases in the villous chorion?
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What is primarily contained within the intervillous space of the placenta?
What is primarily contained within the intervillous space of the placenta?
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What determines the shape of the placenta?
What determines the shape of the placenta?
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Which term describes the shape of the full-term placenta?
Which term describes the shape of the full-term placenta?
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Where do the endometrial arteries and veins open in relation to the placenta?
Where do the endometrial arteries and veins open in relation to the placenta?
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What is the main function of chorionic villi during placental development?
What is the main function of chorionic villi during placental development?
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Which of the following describes a cotyledon in the context of placental anatomy?
Which of the following describes a cotyledon in the context of placental anatomy?
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What covers the chorionic plate and umbilical cord on the fetal side of the placenta?
What covers the chorionic plate and umbilical cord on the fetal side of the placenta?
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How is the placenta generally described when referring to its structure?
How is the placenta generally described when referring to its structure?
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At what anatomical junction does the maternal-fetal interaction primarily occur?
At what anatomical junction does the maternal-fetal interaction primarily occur?
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What is the primary function of the intervillous space in the placenta?
What is the primary function of the intervillous space in the placenta?
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Which of the following correctly describes the composition of maternal blood in the intervillous space?
Which of the following correctly describes the composition of maternal blood in the intervillous space?
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What anatomical feature allows for the material exchange between the mother and fetus?
What anatomical feature allows for the material exchange between the mother and fetus?
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Which statement best describes the role of branch villi in placental circulation?
Which statement best describes the role of branch villi in placental circulation?
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Where are endometrial veins located in relation to the placenta?
Where are endometrial veins located in relation to the placenta?
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What materials are primarily exchanged across the placental membrane?
What materials are primarily exchanged across the placental membrane?
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Which statement is true regarding the maternal blood flow in the intervillous space?
Which statement is true regarding the maternal blood flow in the intervillous space?
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How does maternal blood contribute to fetal development through the placenta?
How does maternal blood contribute to fetal development through the placenta?
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What is the primary purpose of the umbilical arteries in fetal placental circulation?
What is the primary purpose of the umbilical arteries in fetal placental circulation?
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What structure forms after the umbilical arteries divide at the placenta?
What structure forms after the umbilical arteries divide at the placenta?
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Which of the following is true about the blood vessels in the chorionic villi?
Which of the following is true about the blood vessels in the chorionic villi?
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How does fetal blood interact with maternal blood in the placenta?
How does fetal blood interact with maternal blood in the placenta?
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What separates the cotyledons in the placenta during the second half of pregnancy?
What separates the cotyledons in the placenta during the second half of pregnancy?
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What is the main characteristic of the chorionic arteries?
What is the main characteristic of the chorionic arteries?
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What type of blood does the fetal placental circulation predominantly handle?
What type of blood does the fetal placental circulation predominantly handle?
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In the context of fetal placental circulation, where does the transformation of the umbilical arteries occur?
In the context of fetal placental circulation, where does the transformation of the umbilical arteries occur?
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Study Notes
Placental Development
- The villous chorion, also known as the chorionic frondosum, forms the fetal part of the placenta.
- The chorionic villi project into the intervillous space, which contains maternal blood.
- The maternal part of the placenta is formed by the decidua basalis.
- The decidua basalis is nearly entirely replaced by the fetal part of the placenta by the end of the fourth month.
Feto-Maternal Junction
- The chorionic villi are responsible for the shape of the placenta.
- Most placentas are discoid (disk-shaped).
- Endometrial veins are found over the entire surface of the decidua basalis.
Intervillous Space
- The intervillous space is constantly bathed with maternal blood.
- The maternal blood carries oxygen and nutrients for fetal growth and development.
- It also carries away fetal waste products such as carbon dioxide, salts, and protein byproducts.
Placental Circulation
- The placenta provides a large surface area for material exchange.
- This exchange happens across a thin placental membrane between fetal and maternal circulations.
- The most significant exchange of materials between the mother and fetus occurs within numerous branch villi arising from stem villi.
Fetoplacental Circulation
- Poorly oxygenated blood leaves the fetus and travels through the umbilical arteries to the placenta.
- The umbilical arteries branch into several radially disposed chorionic arteries at the point where the umbilical cord connects to the placenta.
- The chorionic arteries branch freely within the chorionic plate before entering the chorionic villi.
Maternal-Placental Circulation
- Maternal blood flows continuously through the intervillous space, washing the chorionic villi.
- This flow is crucial for oxygen and nutrient delivery, and waste removal.
- The maternal circulation is powered by the rhythmic contractions of the uterine wall.
Placental Anatomy
- The numerous, branched chorionic villi provide a large surface area for material exchange.
- The villi are lined by a thin membrane that allows for the passage of oxygen, nutrients, and waste products.
- The intervillous space is filled with maternal blood and is the site of exchange between the mother and fetus.
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Description
Explore the intricacies of placental development, including the formation of the villous chorion and the intervillous space. This quiz helps you understand the essential functions of the placenta in fetal growth and nutrient exchange. Test your knowledge of the feto-maternal junction and placental circulation.
