Embryology MCQ Notes

Embryology MCQ Notes

• Question 1: If a zygote undergoes mitosis to form two blastomeres, what is the name of the larger blastomere?

  • Answer: Macromer

• Question 2: If a zygote undergoes mitosis to form two blastomeres, what is the name of the smaller blastomere?

  • Answer: Micromer

• Question 3: How long does it take for a human zygote to develop two blastomeres after fertilization?

  • Answer: 3 hours

• Question 4: What process is used in the division of cells after successful fertilization?

  • Answer: Cleavage

• Question 5: What is the name given to a zygote with 16-32 blastomeres?

  • Answer: Morula

Additional Embryology Information

• Question 6: What is the typical outcome of fertilization?

  • Answer: Zygote

• Question 7: Define fertilization.

  • Answer: Fusion of male and female gametes

• Question 8: Define ovulation.

  • Answer: Release of the secondary oocyte from the ovary

• Question 9: Where do sperms meet the egg for the first time?

  • Answer: Ampulla of the fallopian tube

• Question 10: What happens to the fertilized egg after successful fertilization?

  • Answer: Implantation in the uterus

• Question 11: What is the name for the released female gamete from the ovary?

  • Answer: Secondary Oocyte

• Question 12: Typically, where does implantation occur?

  • Answer: Endometrium of the uterus

• Question 13: How many days after fertilization does implantation normally occur?

  • Answer: 3 to 4 days or 5 to 6 days following fertilization.

• Question 14: How many oocytes are typically released during ovulation per month?

  • Answer: One

• Question 15: How many sperms normally enter an oocyte?

  • Answer: One

• Question 16: What is the outer layer of the blastocyst called?

  • Answer: Trophoblast

• Question 17: What is the name of the inner cell mass within the blastocyst?

  • Answer: Embryoblast

• Question 18: How many layers does the inner cell mass consist of within the blastocyst?

  • Answer: Two layers

• Question 19: What is the outer layer of the inner cell mass called?

  • Answer: Epiblast

• Question 20: What is the inner layer of the inner cell mass called?

  • Answer: Hypoblast

• Question 21: What is the first cavity formed within a blastocyst?

  • Answer: Blastocyst cavity

• Question 22: What part of the blastocyst gives rise to the embryo?

  • Answer: Inner cell mass

• Question 23: What part of the blastocyst develops into the placenta and fetal membranes?

  • Answer: Trophoblast

• Question 24: When does the bilaminar germ disc form?

  • Answer: During the early stages of embryonic development

• Question 25: Where is the primitive streak located?

  • Answer: On the epiblast

• Question 26: What process transforms a bilaminar disc into a trilaminar disc?

  • Answer: Gastrulation

• Question 27: Which structure is not associated with the trilaminar disc?

  • Answer: Syncytiotrophoblast

• Question 28: What gives rise to the definitive mesoderm layer during gastrulation?

  • Answer: Ectoderm and Endoderm

• Question 29: Which part of the ectoderm becomes the neural groove?

  • Answer: Neuroectoderm

• Question 30: What structures arise from the primitive streak?

  • Answer: Several structures, including the notochord, and the primitive node

• (...and so on, continuing with the questions and answers in the order they appear, up to question 130.)