The inner cell mass of the blastocyst primarily develops into which structure?
Solution
Correct Answer: Option C
- The inner cell mass (ICM) of the blastocyst is a critical structure in early embryonic development.
- It is the group of cells located inside the blastocyst, distinct from the outer layer called the trophoblast.
- The primary role of the inner cell mass is to give rise to the embryo itself.
- The trophoblast, which forms the outer layer, eventually develops into the placenta and other supporting structures necessary for fetal development.
- Meanwhile, the cells of the ICM will proliferate and differentiate to form the three primary germ layers: ectoderm, mesoderm, and endoderm, which collectively establish the entire body of the embryo.
- The amniotic sac, on the other hand, is derived from extra-embryonic tissues that develop later from the trophoblast and related structures, not directly from the inner cell mass.
In summary, the inner cell mass primarily develops into the embryo, making Option 3 the correct choice.
Reference: Langman’s Medical Embryology, 14th Edition, Chapter 5 / Page 45
- It is the group of cells located inside the blastocyst, distinct from the outer layer called the trophoblast.
- The primary role of the inner cell mass is to give rise to the embryo itself.
- The trophoblast, which forms the outer layer, eventually develops into the placenta and other supporting structures necessary for fetal development.
- Meanwhile, the cells of the ICM will proliferate and differentiate to form the three primary germ layers: ectoderm, mesoderm, and endoderm, which collectively establish the entire body of the embryo.
- The amniotic sac, on the other hand, is derived from extra-embryonic tissues that develop later from the trophoblast and related structures, not directly from the inner cell mass.
In summary, the inner cell mass primarily develops into the embryo, making Option 3 the correct choice.
Reference: Langman’s Medical Embryology, 14th Edition, Chapter 5 / Page 45
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