Embryonic Period: Weeks 3-8

Question 1

What is the function of the notochord?

Answer 1

Release substances directing the differentiation of surrounding parts

Question 2

What is the difference between complete and partial mole?

Answer 2

• complete (no embryo): no maternal information, 46XX just paternal.
• partial: haploid maternal information and 2 sets paternal chromosomes, 69XXY

Question 3

The cells in the thyroid gland are derived from which of the layers?

Answer 3

• endoderm and neural crest
• the thyroid follicular cells are derived from endoderm, and the parafollicular, or C, cells are derived from neural crest

Question 4

Which of the layers gives rise to the cells of the adrenal gland?

Answer 4

• mesoderm and neural crest

* Mesoderm gives rise to the adrenal cortex, and the medulla is derived from neural crest

Question 5

Which are the only cartilage that develops from neural crest?

Answer 5

• cartilage that form the pharyngeal archs

* others from mesoderm