Blastulation to Gastrulation

Question 1

extra-embryonic endoderm

Answer 1

Hypoblast

Question 2

4th day

Answer 2

zona pellucida degenerates

Question 3

7th day

Answer 3

implantation

Question 4

9th day

Answer 4

lacunae form within synciotrophoblast, hCG can be detected

Question 5

11-12th day

Answer 5

interstital or complete implantation and primitive uteroplacental circulation

Question 6

12-13th day

Answer 6

endometrial stroma hypertrophied to become decidual cells… somatopleuric ad splanchopleuric and chorionic cavity

Question 7

extraembryonic mesoderm

Answer 7

derived from the yolk sac cells

Question 8

extraembryonic coelom

Answer 8

chorionic cavity, derived from exocelomic mesoderm or yolk sac

Question 9

gastrulation when

Answer 9

15-17 days

Question 10

embryonic ectoderm

Answer 10

epidermis, CNS, PNS, retina of eye

Question 11

embryonic mesoderm

Answer 11

epithilial linings of respiratory tract and GI, glandular cells of GIC, urinary bladder

Question 12

embryonic mesoderm

Answer 12

smooth and striated muscle, connective tissue, most of the cardiovascular system, blood cells, and bone marrow, skeleton, reproductive and excretory glands

Question 13

sacrococcygeal teratomas

Answer 13

remnants of primitive steak that give rise to a tumor with derivatives of the 3 germ layers