Repro2

Question 1

Early fetal development:

- Day 0

Answer 1

Fertilization of sperm forming Zygote

-> Initiating Embryogenesis

Question 2

Early fetal development:

- Within Week 1

Answer 2

hCG secretion begins after implantation of Blastocyst

Question 3

Early fetal development:

- Within Week 2

Answer 3

Bilaminar disc

• Epiblast (dorsal)
• Hypoblast (ventral)

Question 4

Early fetal development:

- Within Week 3

Answer 4

Gastrulation - Trilaminar disc

Primitive streak, notochord, mesoderm and its organization, and neural plate begin to form

Question 5

Early fetal development:

- Weeks 3-8 (embryonic period)

Answer 5

Neural Tube formed by Neuroectoderm and closes by week 4

Organogenesis

*Extremely susceptible to Teratogens

Question 6

Early fetal development:

- Week 4

Answer 6

Heart begins to beat

Upper and Lower limb buds begin to form

Question 7

Early fetal development:

- Week 8 (start of Fetal period)

Answer 7

Fetal movement, Fetus looks like a baby

Question 8

Early fetal development:

- Week 10

Answer 8

Genitalia have male/female characteristics

Question 9

What system begins to develop 1st?

Answer 9

Nervous system

Question 10

What system functions 1st?

Answer 10

Cardiac

Question 11

What is the first indication of gastrulation?

Answer 11

Formation of the primitive streak

*starts with the Epiblast invaginating to form the primitive streak

Question 12

Where does the development of the notochord take place?

Answer 12

Caudad end of Primitive streak

Question 13

How are siamese twins formed?

Answer 13

Incomplete division of Hypoblast (inner cell mass) or Secondary fusion

Formation of 2 Primitive streaks