Question:
The establishment of fetoplacental circulation is seen at which day?
The establishment of fetoplacental circulation is seen at which day?
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Fetoplacental flow needs tertiary villi plus a beating heart.
Updated On: Jun 24, 2026
- 11 to 13 days
- 20 to 22 days
- 7 days
- 25 to 26 days
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The Correct Option is B
Solution and Explanation
Step 1: After implantation the chorionic villi mature in stages: primary villi around day 13, secondary villi around day 16 and tertiary villi (containing fetal vessels) around day 21.
Step 2: Once tertiary villi carry functioning fetal capillaries and the fetal heart begins to beat (around day 21 to 22), true fetoplacental circulation is established.
Step 3: Hence option B, day 20 to 22, is correct. Day 7 marks early blastocyst attachment, day 11 to 13 corresponds to lacunar and primary-villi events, and day 25 to 26 is later than the recognised milestone.
Step 2: Once tertiary villi carry functioning fetal capillaries and the fetal heart begins to beat (around day 21 to 22), true fetoplacental circulation is established.
Step 3: Hence option B, day 20 to 22, is correct. Day 7 marks early blastocyst attachment, day 11 to 13 corresponds to lacunar and primary-villi events, and day 25 to 26 is later than the recognised milestone.
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