Study Guide – Chapter 3
Embryology
1. The first 8 weeks of development is commonly called the
period.
2. The remaining 30 weeks is referred to as the
period.
3. The fertilized egg is also known as the
4. When are blastomeres produced?
5. How does a morula differ from a blastocyst?
6. What two distinct cell layers does one find in a blastocyst?
6a. Which of these cell layers takes part in the formation of the placenta
6b. Which of these cell layers gives rise to the various tissues of the body?
7. From what do the hypoblast and epiblast form?
7a. Which of these layers is closest to the amniotic cavity?
8. How does the bilaminar disc differ from the trilaminar disc?
9. From which layer of the trilaminar disc does the ectoderm develop?
10. From which layer of the trilaminar disc does the endoderm develop?
11. From which layer of the trilaminar disc does the mesoderm develop?
12. The body axis is largely determined by a structure known as the
13. What structures are developed during neurulation?
14. What embryonic layer takes part in neurulation?
15. Where in the embryo might you find neural crest cells?
16. What three major regions develop from the mesoderm?
17. From which of these regions do the somites develop?
18. What are the three major regions of a somite? (see p. 62)
19. Identify the region of the somite from which each of the following develops:
a. Trunk and limb muscles
b. Vertebrae and ribs
c. Dermis of the dorsal body region
20. What are the two major divisions of the lateral plate mesoderm?
21. Identify the region of the lateral plate mesoderm from which each of the following develops:
a. Visceral serosa? (Same layer you studied in lab 1)
b. Parietal serosa? (Same layer you studied in lab 1)
c. Dermis of the ventral body region (see 19c above)
d. Heart and blood vessels
e. Bones, joints and ligaments of limbs
f. Wall of the digestive and respiratory tract
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