Conception, Implantation, and Placental Development

Question 1

Pre-embryonic development begins with

Answer 1

fertilization

Question 2

Fertilization is followed by

Answer 2

a generation of a ball of cells

Question 3

After the generation of a ball of cells, there is

Answer 3

differentiation of inner cell mass from the outer cell mass

Question 4

The point where there is a differentiation between inner and outer cell mass is called the

Answer 4

blastocyst

Question 5

What step follows blastocyst formation?

Answer 5

Implantation into the uterine wall

Question 6

Pre-embryonic development takes place during which weeks of development

Answer 6

Weeks 1 and 2

Question 7

What process follows implantation and when does it begin?

Answer 7

Gastrulation and week 3

Question 8

The basic axes of the body are laid out and major germ layers are generated during

Answer 8

gastrulation and neurulation

Question 9

By when does the embryo have basic body form?

Answer 9

Week 8

Question 10

When is the embryonic period and when does it end?

Answer 10

Weeks 3-8

Question 11

What period follows the embryonic period and when does it occur?

Answer 11

Fetal period and Weeks 9-38

Question 12

Name the stage:

Two cells unite to make a zygote

Answer 12

Fertilization

Question 13

Name the stage:

Large egg mass divided into smaller cells by slow divisions

Answer 13

Cleavage

Question 14

Name the stage:
Opening of fluid filled cavity in ball of cells, inner cell mass is future embryo and outer cells are future extra-embryonic membranes

Answer 14

Blastocyst

Question 15

Name the stage:

Outer cells make contact with uterine wall and begin to differentiate into supporting membranes of the placenta

Answer 15

Implantation

Question 16

Name the stage:

Sweeping cellular movements generate 3 key cell layers: ectoderm, mesoderm, and endoderm

Answer 16

Gastrulation

Question 17

Name the layer:

Will give rise to skin, hair, and sweat glands

Answer 17

Ectoderm

Question 18

Name the layer:

Will give rise to the nervous system

Answer 18

Ectoderm

Question 19

Name the layer:

Gives rise to the neural tube

Answer 19

Ectoderm

Question 20

Name the layer:

Gives rise to the central nervous system

Answer 20

Neural tube (ectoderm)

Question 21

Name the stage and the outcome:

in-folding of the outer ectoderm in the dorsal midline

Answer 21

Neurulation and gives rise to the neural tube

Question 22

Neural crest is derived from _____ which is derived from the _____ layer

Answer 22

neural tube; ectoderm

Question 23

The brain and spinal cord are derived from _____ which comes from the ______ layer

Answer 23

neural tube; ectoderm

Question 24

The posterior pituitary is derived from _____ which comes from the ______ layer

Answer 24

neural tube; ectoderm

Question 25

The optic vesicle is derived from____ which comes from the_____ layer

Answer 25

neural tube; ectoderm

Question 26

The retina is derived from____ which comes from the____ layer

Answer 26

neural tube; ectoderm

Question 27

The optic nerve is derived from____ which comes from the_____

Answer 27

neural tube; ectoderm

Question 28

The cranial and spinal motor nerves are derived from_____ which comes from_____

Answer 28

neural tube; ectoderm

Question 29

The sensory neurons are derived from the____ which comes from the_____

Answer 29

neural crest; ectoderm

Question 30

The glia of the dorsal root ganglia are derived from the____ which comes from the_____

Answer 30

neural crest; ectoderm

Question 31

Which cells of the ectoderm are migratory?

Answer 31

Neural crest cells

Question 32

In the bilaminar disc, the inner cell mass is divided into _____ and _______

Answer 32

epiblast; hypoblast

Question 33

primordial germ cells are derived directly from_____

Answer 33

epiblast

Question 34

The placenta is derived from the ______

Answer 34

trophoblast

Question 35

The thymus is derived from _______ which comes from the ______ layer

Answer 35

pharyngeal pouches; endoderm

Question 36

The parathyroid glands are derived from ______ which come from the ______ layer

Answer 36

pharyngeal pouches; endoderm

Question 37

The C-cells of the thyroid glands are derived from ______ which come from the ______ layer

Answer 37

pharyngeal pouches; endoderm

Question 38

The epithelium of the Eustachian tube is derived from_____ which come from the ______ layer

Answer 38

pharyngeal pouches; endoderm

Question 39

The middle ear cavity is derived from _____ which come from the ______ layer

Answer 39

pharyngeal pouches; endoderm

Question 40

The palatine tonsil is derived from ______ which come from the _____ layer

Answer 40

pharyngeal pouches; endoderm

Question 41

The intestine is derived from _____ which comes from the ______ layer

Answer 41

primitive gut tube; endoderm

Question 42

The liver is derived from ______ which comes from the _____ layer

Answer 42

primitive gut tube; endoderm

Question 43

The pancreas is derived from the ________ which comes from the _______ layer

Answer 43

primitive gut tube; endoderm

Question 44

The pharynx is derived from the _____ which comes from the ______ layer

Answer 44

primitive gut tube; endoderm

Question 45

The trachea is derived from the _____ which comes from the ____ layer

Answer 45

primitive gut tube; endoderm

Question 46

The lungs are derived from the ______ which comes from the _____ layer

Answer 46

primitive gut tube; endoderm

Question 47

The bladder is derived from the _____ which comes from the ______ layer

Answer 47

primitive gut tube; endoderm

Question 48

The urethra is derived from the _____ which comes from the _____ layer

Answer 48

primitive gut tube; endoderm

Question 49

The prostate is derived from the _____ which comes from the ____ layer

Answer 49

primitive gut tube; endoderm

Question 50

The Allantois is derived from the ____ which comes from the _____ layer

Answer 50

primary gut tube; endoderm