Reproductive

Question 1

What happens at Day 0 of early fetal development?

Answer 1

Fertilization by sperm forming zygote, initiating embryogenesis

Question 2

What happens within week one of early fetal development?

Answer 2

hCG secretion begins after implantation of blastocyst

Question 3

What happens within week two of early fetal development?

Answer 3

Bilaminar disc (epiblast, hypoblast). 2 weeks = 2 layers

Question 4

What happens within week three of early fetal development?

Answer 4

Trilaminar disc. 3 weeks = 3 layers.
Gastrulation.
Primitive streak, notochord, mesoderm and its organization, and neural plate begin to form

Question 5

What happens within weeks 3-8 (Embryonic period) of early fetal development?

Answer 5

Neural tube formed by neuroectoderm and closes by week 4.
Ogranogenesis.
Extremely susceptible to teratogens!

Question 6

What happens within week four of early fetal development?

Answer 6

Heart begins to beat.
Upper and lower limb buds begin to form.
4 weeks = 4 limbs

Question 7

What happens within week eight (Start of fetal period) of early fetal development?

Answer 7

Fetal movement, fetus looks like a baby.

Question 8

What happens within week ten of early fetal development?

Answer 8

Genitalia have male/female characteristics