6: Fetal Development

Question 1

Fertilization, preembryonic development, embryonic development, or fetal development?
Implantation

Answer 1

Preembryonic development

Question 2

When does quickening occur?

Answer 2

Maternal perception of fetal movement typically begins in the second trimester at around 16 to 20 weeks of gestation and occurs earlier in parous women than nulliparous women. The mother’s first perception of fetal movement, termed “quickening,” is often described as a gentle flutter.

Question 3

Fertilization, preembryonic development, embryonic development, or fetal development?
Meiosis II

Answer 3

Fertilization

Question 4

Chorion develops from _____?

Answer 4

Trophoblast

Question 5

Fertilization, preembryonic development, embryonic development, or fetal development?
Block to polyspermy

Answer 5

Fertilization

Question 6

Fertilization, preembryonic development, embryonic development, or fetal development?
Formation of zygote

Answer 6

Fertilization

Question 7

Trophoblast adheres to endometrium.

Answer 7

Implantation II

Question 8

What forms between chorionic villi and basal layer of endometrium?

Answer 8

Decidua basalis

Question 9

When does the blastocyst reach the uterus?

Answer 9

Day 6 of cycle

Question 10

T/F The placenta prevents mixing of maternal and embryonic blood.

Answer 10

True

Question 11

Human chorionic gonadotropin (hCG) is secreted by trophoblast, maintains corpus luteum.

Answer 11

Implantation IV

Question 12

Where are lacunae?

Answer 12

Functional layer of endometrium.

Question 13

When is the fetal heartbeat seen/heard?

Answer 13

US: 6 weeks
Doppler: 10-12 weeks
Fetoscope: 17-20 weeks

Question 14

Fertilization, preembryonic development, embryonic development, or fetal development?
Formation of embryonic membranes

Answer 14

Embryonic development

Question 15

When is the placenta functional?

Answer 15

By 3rd month

Question 16

Fertilization, preembryonic development, embryonic development, or fetal development?
Acrosomal reaction

Answer 16

Fertilization

Question 17

Trophoblast forms two layers.

Answer 17

Implantation III

Question 18

The placenta forms between what?

Answer 18

Placenta forms between chorionic villi and decidua basalis.

Question 19

Fertilization, preembryonic development, embryonic development, or fetal development?
Formation of blastocyst

Answer 19

Preembryonic development

Question 20

What are the 2 layers of the trophoblast?

Answer 20

1. Cytotrophoblast: inner layer, maintains cell boundary.

2. Syncytiotrophoblast: outer layer, invades endometrium.

Question 21

Blastocyst reaches uterus on day 6 of cycle.

Answer 21

Implantation I

Question 22

Fertilization, preembryonic development, embryonic development, or fetal development?
Cleavage reactions

Answer 22

Preembryonic development

Question 23

Trophoblast releases digestive enzymes.

Answer 23

Implantation II

Question 24

Fertilization, preembryonic development, embryonic development, or fetal development?
Gastrulation

Answer 24

Embryonic development

Question 25

What secretes hCG?

Answer 25

Trophoblast

Question 26

What hormones are secreted by the placenta?

Answer 26

Progesterone
Estrogens
Human placental lactogen
Human chorionic thyrotropin
Relaxin

Question 27

Fertilization, preembryonic development, embryonic development, or fetal development?
Development of systemic structures.

Answer 27

Fetal development

Question 28

Fertilization, preembryonic development, embryonic development, or fetal development?
Capacitation of sperm.

Answer 28

Fertilization

Question 29

Fertilization, preembryonic development, embryonic development, or fetal development?
Organogenesis

Answer 29

Embryonic development