Embryonic Development

Question 1

Sequence of Events of Spermatoza in Female Tract

Answer 1

1. Immediate Transport
2. Cervix
3. Uterus
4. Oviduct
5. Fertilization

Question 2

When do semen pass through the uterotubual?

Answer 2

After uterus before oviduct

Question 3

What happens during immediate transport?

Answer 3

• Retrograde loss
• Phagocytosis
• Entrance into cervix/uterus

Question 4

What happens during when semen passes through the cervix?

Answer 4

• Remove of nonmotile sperm
• Removal of some abnormalities

Question 5

What happens when semen passes through uterus?

Answer 5

• Capacitation initiated
  Phagocytosis via macrophages in uterus

Question 6

What happens when semen passes through the oviduct?

Answer 6

• Capacitation completed
• Hyperactive motility

Question 7

What happens during fertilization?

Answer 7

• Acrosome reaction
• Spermatozoon penetrates oocyte
• male and female pronuclei form

Question 8

What proteins is the zona pellucida made of?

Answer 8

3 - ZP1, ZP2, ZP3

Question 9

What does fertilization signify?

Answer 9

End of meiosis II

Question 10

What forms the placenta?

Answer 10

Trophoblast (outer cells)

Question 11

What becomes the embryo?

Answer 11

Inner cell mass

Question 12

What are embryo cells called?

Answer 12

Blastomere

Question 13

3 Germ Layers of Gastruation

Answer 13

Ectoderm
Mesoderm
Endoderm

Question 14

What is the ectoderm?

Answer 14

Outer layer, skin + nervous syster

Question 15

What is the mesoderm?

Answer 15

Middle layer - organs + bones

Question 16

What is the endoderm?

Answer 16

Inner Layer - lining of hollow tubs + organs

Question 17

What is plasmotation?

Answer 17

Formation of placenta

Question 18

What is an Allantois

Answer 18

4th placental membrane - umbilical chord + urinary bladder

Question 19

What is used to detect early pregnancy?

Answer 19

Human chorionic gonadotropin

Question 20

After fertilization, what is it called day 1 through week 8?

Answer 20

Embryo

Question 21

After fertilization, what is it called from week 9 - birth?

Answer 21

fetus

Question 22

What are the 4 layers of the placenta?

Answer 22

Chorion
Allantois
Amnion
Yolk Sak

Question 23

What is the chorion

Answer 23

Outer - communication

Question 24

What is the allantois?

Answer 24

Umbillical chord

Question 25

What is the amnion?

Answer 25

Amniotic fluid/protection

Question 26

Who produces blood in placenta?

Answer 26

Egg sac

Question 27

Answer 27

1. Granulosa Cells of corona radiata 2. Zona pellucida 3. Corticol granules

Question 28

Answer 28

1. Male + Female Pro-Nuclei 2. Polar Bodies

Question 29

Answer 29

1. Zygote 2. 4-Cell Stage 3. Morula 4. Early blastocyst 5. Trophoblast 6. Inner Cell Mass

Question 30

Answer 30

Cell Zygote

Question 31

Answer 31

2-Cell embryo

Question 32

Answer 32

4- cell embryo

Question 33

Answer 33

8-cell embryo

Question 34

Answer 34

Compacting Morula

Question 35

Answer 35

compacting morula

Question 36

Answer 36

Compact Morula

Question 37

Answer 37

Blastocyst

Question 38

Answer 38

Expanded Blastocyst

Question 39

Answer 39

Hatching Blastocyst

Question 40

Answer 40

hatched blastocyst

Question 41

Answer 41

1. Implanting 7 day blastocystt 2. 12-day blastocyst 3. 16-day embryo 4. Chorion 5. Amrion 6. Ectoderm 7. Mesoderm 8. Endoderm 9. Allantois

Question 42

Answer 42

1. Early Pregnancy Detection 2. Human Chorionic Gonadotopin

Question 43

Answer 43

Chorionic Villus containing fetal capillaries

Question 45

The __________ implants in the uterine wall.

Answer 45

Blastocyst

Question 46

The __________ gives rise to the epidermis of the skin and the nervous system.

Answer 46

Ectoderm

Question 47

By the ninth week of development, the embryo is referred to as a \_\_\_\_\_\_\_\_\_\_.

Answer 47

Fetus

Question 48

The __________ encases the young embryonic body in a fluid-filled chamber that acts to protect the developing embryo against trauma.

Answer 48

Amnion

Question 49

Answer 49

1. Ovulation 2. Oocyte 3. Fertilization 4. Zygote 5. 4- Cell Stage 6. Morula 7. Early Blastocyst 8. Implanting Blastocyst

Question 50

This portion of the blastocyst forms the embryo proper.

Answer 50

inner cell mass

Question 51

In the human, this germ cell layer gives rise to many of the organ systems, including the skeleton, skeletal muscles, walls of GI organs, urinary system, and circulatory system.

Answer 51

mesoderm

Question 52

In humans, the yolk sac \_\_\_\_\_\_\_\_.

Answer 52

is the site of origin for blood cells and primordial germ cells

Question 53

This embryonic membrane provides the structural basis for the umbilical cord.

Answer 53

allantois