Placenta, Fetal Membranes and Twinning is part of the Embryology section of Anatomy. Practise 15 exam-style MCQs for NEET PG, FMGE, INI-CET and NEET SS, each with the correct answer and a detailed explanation.
Placenta, Fetal Membranes and Twinning MCQs move from syncytiotrophoblast invasion and hCG production through chorionic villi, the yolk sac and the allantois to placenta praevia as a cause of antepartum haemorrhage — high-yield NEET PG revision.
Sample Placenta, Fetal Membranes and Twinning MCQs with answers
Sample MCQ #1
Which layer invades into the maternal endometrium and forms the lacunar network for placental-maternal exchange?
ABlastocyst
BCytotrophoblast
CSyncytiotrophoblast
DEndoderm
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✓ Correct Answer: C. Syncytiotrophoblast
The syncytiotrophoblast layer formed from the trophoblast invades the maternal endometrium. It comes into contact with blood vessels and forms lacunae, spaces filled with maternal blood. This forms the lacunar network that functions in the exchange of nutrients and waste products between mother and fetus. Reference - Textbook of Langman's, 12th Edition, General Embryology Page number - 43
Sample MCQ #2
Which layer is acellular, does not expand mitotically, and produces human chorionic gonadotropin (hCG) which stimulates progesterone production by the corpus luteum?
ASyncytiotrophoblast
BCytotrophoblast
CEpiblast
DEndoderm
Show Answer & Explanation ▾
✓ Correct Answer: A. Syncytiotrophoblast
Syncytiotrophoblast is acellular, does not expand mitotically, and produces human chorionic gonadotropin (hCG) which stimulates progesterone production by the corpus luteum. B-hCG produced can be detected in maternal blood as early as day 10 of pregnancy and is part of the pregnancy test. Cytotrophoblast is cellular, expands mitotically into syncytiotrophoblast to form primary chorionic villi that can be used in chorionic villus sampling that is genetic testing for the early fetus. Reference - Textbook of Langman's, 12th Edition, General Embryology Page number - 43
Sample MCQ #3
Which layer is cellular and expands mitotically into syncytiotrophoblast to form primary chorionic villi that can be used in chorionic villus sampling or genetic testing for the early fetus?
ASyncytiotrophoblast
BCytotrophoblast
CEpiblast
DEndoderm
Show Answer & Explanation ▾
✓ Correct Answer: B. Cytotrophoblast
Cytotrophoblast is cellular, expands mitotically into syncytiotrophoblast to form primary chorionic villi that can be used in chorionic villus sampling that is genetic testing for the early fetus. Syncytiotrophoblast is acellular, does not expand mitotically, and produces human chorionic gonadotropin (hCG) which stimulates progesterone production by the corpus luteum. B-hCG produced can be detected in maternal blood as early as day 10 of pregnancy and is part of the pregnancy test. Reference - Textbook of Langman's, 12th Edition, General Embryology Page number - 43
Sample MCQ #4
By 13-14 days of development, angiogenic cell clusters have differentiated in the:
AExtraembryonic mesoderm of the chorion
BSplanchnic mesoderm in the wall of the yolk sac
CCardiogenic mesoderm
DAll of the above
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✓ Correct Answer: D. All of the above
Angiogenic cell clusters develop in all of these areas, giving rise to the cardiovascular system in the embryo. Within the embryo, the angiogenic cell clusters are found in the horse-shoe shaped region beneath the intraembryonic coelom. Cranial to the prochordal plate lies the cardiogenic region, part of this larger area. Reference - Textbook of Langman's, 12th Edition, Cardiovascular System Embryology Page number - 162
Sample MCQ #5
The definitive yolk sac of the embryo appears by what day?
A13th
B26th
C72nd
D94th
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✓ Correct Answer: A. 13th
Around the 13th day, the definitive yolk sac is formed by the hypoblast cells that line the inside of the exocoelomic membrane. Reference - Textbook of Langman's, 12th Edition, General Embryology Page number - 43
Sample MCQ #6
The allantois is derived from:
AEctoderm
BEndoderm
CBoth
DNeither
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✓ Correct Answer: B. Endoderm
The allantois is an endodermal outpouching of the yolk sac. Early on, it is attached to the hindgut, but when the urorectal septum divides the cloaca, it becomes associated with the urinary bladder and contributes to its development. The allantois forms the urachus and then the median umbilical ligament. Reference - Textbook of Langman's, 12th Edition, Digestive System Embryology Page number - 208
Sample MCQ #7
The yolk sac detaches from the gut by the end of the:
A2nd week
B5th week
C3rd month
D4th month
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✓ Correct Answer: B. 5th week
Through body folding, the yolk sac separates from the gut during the 5th week, although the gut remains attached to the yolk sac by the vitelline duct, which persists into the third month of development. Reference - Textbook of Langman's, 12th Edition, Digestive System Embryology Page number - 208
Sample MCQ #8
Implantation of the embryo in the lower uterus can cause what medical condition that may lead to hemorrhage, fetal insufficiency, and even death for both mother and baby due to obstruction of the birth canal?
APlacenta abortion
BPlacenta previa
CPlacenta divisum
DPlacenta increta
Show Answer & Explanation ▾
✓ Correct Answer: B. Placenta previa
Implantation of the embryo in the lower uterus can cause placenta previa, in which the placenta obstructs the birth canal. If Cesarean section is not performed, it can lead to hemorrhage, fetal insufficiency, and even death. Reference - Textbook of Langman's, 12th Edition, General Embryology Page number - 29
What you can practise in Placenta, Fetal Membranes and Twinning
15 Placenta, Fetal Membranes and Twinning MCQs on Placenta, Fetal Membranes, Twinning — each with detailed explanations
Previous-year question practice across NEET PG, FMGE, INI-CET and NEET SS
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What do Placenta, Fetal Membranes and Twinning MCQs cover?
Placenta, Fetal Membranes and Twinning MCQs move from syncytiotrophoblast invasion and hCG production through chorionic villi, the yolk sac and the allantois to placenta praevia as a cause of antepartum haemorrhage — high-yield NEET PG revision.
How many Placenta, Fetal Membranes and Twinning questions are there, and which exams do they cover?
MedLadder includes 15 curated MCQs for Placenta, Fetal Membranes and Twinning under Anatomy (Embryology), covering NEET PG, FMGE, INI-CET and NEET SS preparation.
