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प्रश्न
Explain the phases in embryonic development from the morula stage till the establishment of pregnancy in a human female.
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उत्तर
- The embryo with 8 to 16 blastomeres is called a morula.
- The morula continues to divide and transforms into a blastocyst as it moves further into the uterus.
- The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and An inner group of cells attached to the trophoblast is called the inner cell mass.
- The trophoblast layer then gets attached to the endometrium, and the inner cell mass gets differentiated as the embryo.
- After attachment, the uterine cells divide rapidly and cover the blastocyst.
- As a result, the blastocyst becomes embedded in the endometrium of the uterus. This is called implantation and it leads to pregnancy.
Fertilisation and passage of growing embryo in the fallopian tube.
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| 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. |
| IV. | 24 weeks | (S) | Eyelids separate. |
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