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Embryology Questions & Answers
1. What is present in the 2nd week of development of extraembryonic
cavity? Exocoelomic cysts.
2. In IVF, what is used to stimulate ovaries? Gonadotropins are used to
stimulate ovaries.
3. On which day does the posterior neuropore close? Day 23.
4. Which are following are derived from the endoderm? None of the
following.
5. Which embryonic layer is in contact with parietal hypoblast?
Cytotrophoblast.
6. Which layer is generated by the epiblast? Epiblast.
7. Why layer are the primary villi originated from? Cytotrophoblast.
8. What structure is under the neural tube? Notochord.
9. How long does semen capacitation take? 10 hours.
10. What is the placenta? Haemochoral.
11. What is the percentage of sperm in a sample? 140%.
12. On which day does the process of Allantosis begin? Days 15-16.
13. When does second meiosis of oogenesis occur? Fertilisation.
14. At the eighth day of development the hypoblast consists of? Small
cuboidal cells.
15. The amniotic cavity is formed by cells of the? Epiblast.
16. Approximately how long after fertilization occurs the first cleavage of
the zygote? 30 hours.
17. The primitive endothelial cells are formed by? Cells lining the yolk
sac.
18. In the begining of the 3rd week the paraxial mesoderm differentiates
into segments known as? Somites.
19. Which embryonic layer is in a direct contact with the parietal
hypoblast until the formation of the extraembryonic mesoderm?
Cytotrophoblast.
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20. Monozygous twins may have: Common amnion, placenta and
chorion.
21. The intraembryonic lateral plate mesoderm generates which of the
following? Limb buds.
22. Which of the statements regarding the types of spermatogionia is
NOT true? Stem cells generating Sertolli cells.
23. The number of oogonia at birth is approximately? 700 000- 2 000
000.
24. The primitive endothelial cells are formed by? Cell linings of the yolk
sac.
25. The amniotic and yolk sac cavities are temporarily connected by? The
neurenteric canal.
26. The intraembryonic intermediate mesoderm forms? Gonads.
27. From which germ layer originates the adenohypophysis (anterior
pituitary)? Surface ectoderm.
28. Which pharyngeal arch contributes to most of middle ear ossicles?
Second.
29. Which cells are generated by the secondary spermatocytes? Early
spermatids.
30. Which еffect have prostaglandins of the semen? A+C.
31. How does the female reproductive tract assist sperm migration? B. +
C.
32. Which of the following statements is true? Chorionic villi are part of
the foetal placenta part.
33. The merging of which structures contributes to the development of
the face? Maxillary & Mandibullar processes and Frontonasal
prominence.
34. From which component of the blastocyst can be isolated stem cells
capable of organ regeneration in humans? Embryoblast.
35. Which of the zona pellucida proteins acts as a receptor for
spermatozoa binding? ZP3.
36. What is the name of the outer layer of the blastocyst? Trophoblast.
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Embryology Questions & Answers
1. What is present in the 2nd week of development of extraembryonic
cavity? Exocoelomic cysts.
2. In IVF, what is used to stimulate ovaries? Gonadotropins are used to
stimulate ovaries.
3. On which day does the posterior neuropore close? Day 23.
4. Which are following are derived from the endoderm? None of the
following.
5. Which embryonic layer is in contact with parietal hypoblast?
Cytotrophoblast.
6. Which layer is generated by the epiblast? Epiblast.
7. Why layer are the primary villi originated from? Cytotrophoblast.
8. What structure is under the neural tube? Notochord.
9. How long does semen capacitation take? 10 hours.
10. What is the placenta? Haemochoral.
11. What is the percentage of sperm in a sample? 140%.
12. On which day does the process of Allantosis begin? Days 15-16.
13. When does second meiosis of oogenesis occur? Fertilisation.
14. At the eighth day of development the hypoblast consists of? Small
cuboidal cells.
15. The amniotic cavity is formed by cells of the? Epiblast.
16. Approximately how long after fertilization occurs the first cleavage of
the zygote? 30 hours.
17. The primitive endothelial cells are formed by? Cells lining the yolk
sac.
18. In the begining of the 3rd week the paraxial mesoderm differentiates
into segments known as? Somites.
19. Which embryonic layer is in a direct contact with the parietal
hypoblast until the formation of the extraembryonic mesoderm?
Cytotrophoblast.
Downloaded by Austine Wanjala ()
, lOMoARcPSD|47166518
20. Monozygous twins may have: Common amnion, placenta and
chorion.
21. The intraembryonic lateral plate mesoderm generates which of the
following? Limb buds.
22. Which of the statements regarding the types of spermatogionia is
NOT true? Stem cells generating Sertolli cells.
23. The number of oogonia at birth is approximately? 700 000- 2 000
000.
24. The primitive endothelial cells are formed by? Cell linings of the yolk
sac.
25. The amniotic and yolk sac cavities are temporarily connected by? The
neurenteric canal.
26. The intraembryonic intermediate mesoderm forms? Gonads.
27. From which germ layer originates the adenohypophysis (anterior
pituitary)? Surface ectoderm.
28. Which pharyngeal arch contributes to most of middle ear ossicles?
Second.
29. Which cells are generated by the secondary spermatocytes? Early
spermatids.
30. Which еffect have prostaglandins of the semen? A+C.
31. How does the female reproductive tract assist sperm migration? B. +
C.
32. Which of the following statements is true? Chorionic villi are part of
the foetal placenta part.
33. The merging of which structures contributes to the development of
the face? Maxillary & Mandibullar processes and Frontonasal
prominence.
34. From which component of the blastocyst can be isolated stem cells
capable of organ regeneration in humans? Embryoblast.
35. Which of the zona pellucida proteins acts as a receptor for
spermatozoa binding? ZP3.
36. What is the name of the outer layer of the blastocyst? Trophoblast.
Downloaded by Austine Wanjala ()
