human embryo timing

Question 1

fertilization and first cleavage by?

Answer 1

first 16-18 hours

Question 2

end of week 1

Answer 2

blastula and implantation

Question 3

end of week 2

Answer 3

2 layer embryo

Question 4

end of week 3

Answer 4

three layer embryo gastrulation/ three germ layers, ecto, meso, endo

Question 5

end week 4

Answer 5

heart, gut, kidneys. limbs dev. egins

Question 6

end of week 6

Answer 6

limbs completed

Question 7

end week seven

Answer 7

skeletal system

Question 8

end of week eight

Answer 8

embryo complete