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Question
When and where do chorionic villi appear in humans?
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Solution
Chorionic villi are finger-like projections that arise from the trophoblast layer that develops in the zygote after it has undergone implantation.
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RELATED QUESTIONS
Gonads develop from embryonic ______.
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
Mark the odd one.
Match the columns I and II with reference to weeks of pregnancy and the development of a human embryo. Select the correct option from the choices given below:
| Column I | Column II | ||
| I. | 8 weeks | (P) | Limbs and external genital organs |
| II. | 12 weeks | (Q) | Limbs and digits develop. |
| III. | 20 weeks | (R) | Body hair develops. |
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