Deck 3: Formation of Germ Layers and Early Tissue and Organ Differentiation

Question 1

________ Gives rise to most of the embryonic mesoderm

A)A
B)B
C)C
D)D
E)E

Answer 1

D
The primitive streak,a linear band of epiblast,gives rise to mesoderm mainly during the third week.The mesoderm extends laterally and becomes continuous with the extraembryonic mesoderm on the amnion and umbilical vesicle.

Question 2

________ Embryonic ectoderm

A)A
B)B
C)C
D)D
E)E

Answer 2

B
The embryonic ectoderm in the region indicated forms a neural fold.The neural folds soon fuse,converting the neural plate into the neural tube.

Question 3

________ Derived from primitive streak

A)A
B)B
C)C
D)D
E)E

Answer 3

E
The intraembryonic mesoderm is derived from the primitive streak.The primitive streak produces mesoderm rapidly during the third and fourth weeks.

Question 4

________ Splanchnopleure

A)A
B)B
C)C
D)D
E)E

Question 5

________ Source of mesenchyme

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 6

________ Umbilical artery

A)A
B)B
C)C
D)D
E)E

Question 7

________ Derived from paraxial mesoderm

A)A
B)B
C)C
D)D
E)E

Question 8

________ Appears on extraembryonic membranes

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 9

________ Derived from notochordal process

A)A
B)B
C)C
D)D
E)E

Question 10

________ Site of the prechordal plate

A)A
B)B
C)C
D)D
E)E

Question 11

________ Notochordal process

A)A
B)B
C)C
D)D
E)E

Question 12

________ Aggregation of angioblasts

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 13

________ Gives rise to the brain and spinal cord

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 14

________ Forms the basis of the axial skeleton

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 15

________ Neural groove

A)A
B)B
C)C
D)D
E)E

Question 16

________ Fusing to form neural tube

A)A
B)B
C)C
D)D
E)E

Question 17

________ Diverticulum of umbilical vesicle (yolk sac)

A)Allantois
B)Primitive streak
C)Notochord
D)Blood island
E)Neural plate

Question 18

________ Gives rise to an adult body cavity

A)A
B)B
C)C
D)D
E)E

Question 19

________ Wall of amniotic sac

A)A
B)B
C)C
D)D
E)E

Question 20

________ Primitive pit

Question 21

________ Vitelline artery

A)A
B)B
C)C
D)D
E)E

Question 22

________ Sinus venosus

A)A
B)B
C)C
D)D
E)E

Question 23

________ Contains umbilical vessels

A)A
B)B
C)C
D)D
E)E

Question 24

________ Tertiary chorionic villus

A)A
B)B
C)C
D)D
E)E