Embryology

Question 1

Morula

Answer 1

Solid ball of cells, formed after implantation

Question 2

Blastula

Answer 2

From morula. Hallow ball of cells single layer thick. Contains blastocoel (fluid secreted by cells).

Question 3

Two layer gastrula

Answer 3

“Inpocketing,” endoderm inside, ectoderm on exterior.

Question 4

Three layer gastrula

Answer 4

Mesoderm forms between ectoderm and endoderm.

Formation and rearrangement of the three germ layers is known as gastrulations.

Question 5

Ectoderm

Answer 5

Skin and sweat glands, eyes, hair, teeth, nervous system

Question 6

Mesoderm

Answer 6

Musculoskeletal system, circulatory system, kidneys (excretory-bladder lining), gonads, dermis

Question 7

Endoderm

Answer 7

Lining of digestive and respiratory tracts, lining of bladder, pancreas, and liver.

Question 8

Chorion

Answer 8

Lines inside of egg shell, permits gas exchange

Question 9

Allantois

Answer 9

Sac developed from digestive tract, carries out respiration and excretion, has many blood vessels

Question 10

Amnion

Answer 10

Encloses amniotic fluid, watery environment for embryo

Question 11

Yolk sac

Answer 11

Encloses yolk. Blood vessels in yolk transfer food to developing embryo.