Embryology MCQ Flashcards Preview

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Flashcards in Embryology MCQ Deck (46):
1

Vemix caseosa is a fatty substance covering by the end of the intrauterine life:

Skin of the fetus

2

The buccopharyngeal mebraneis formed by:

Ectoderm and endoderm

3

Placenta previa result from implantation in:

The region of the internal opening (os) of the cervix

4

Erythboblastosis is fetalis disease may occur in cases where:

The fetus is RH(+) and the mother is RH(-)

5

Cotyledons are compartments of:

Umbilical cord

6

Situs inversus is a condition occurring in approximately 20% of patients with:

Kartagener syndrome

7

The embryo at the time of implantation is in the :

8-cell stage

8

Maintaining of structure and function of corpus luteum during the first intrauterine of pregnancy depending on:

hCG

9

The length of a normal pregnancy is considered to be:

280 days after fertilization

10

During ovulation extruded from ovary to the uterine tube is the:

Secondary occyte in metaphase

11

The lens placode is a derivative of:

Ectodermal germ layer

12

Which one is not the approach used for assisted reproductive technology?

a.ICSI
b.ZIFT
c.OMI

13

A phenomenon occurring during the third week of development is:

Formation of the notochord

14

The parenchyma of the thyroid gland develops from the:

Endoderm

15

Which one is the derivative of somite?

Subcutaneous tissue of the skin

16

The process of compaction occurs at:

8-cell stage

17

The secondary yolk sac in an embryo is at age of:

13 days

18

The umbilical cord during the end of 4th month containg

a.One artery and one vein
b.Two arteries
c.One artery and two veins
d.Two artery and two veins
e.None of them

19

The uteroplacental circulation begins by the end of the:

Secondary week of the development

20

An abnormal number of sex chromosomes occurs in:

Tumer syndrome

21

Interior parathyroid gland develops from:

3rd pharyngeal pouch

22

Vitelline duct:

Connects cavity of yolk sac with midgut

23

Chorion frondosum has got contact with:

Decidua basalis

24

Ultimobranchial body contributes cells to:

Thyroid

25

Which one is a phenomenon occurring during the acrosome reaction?

Release of trypsin-like enzymes and acrosin

26

Sirenomelia (caudal dysgenesis) results from insufficient formation in the lumbosacral region:

Mesoderm

27

Which one is a component of the uterus?

Basal layer

28

Spermatogenesis is a process resulting in the transformation of:

Spermatogonia into spermatozoa

29

The process of formation of blood vessels by sprouting from existing vessels:

Angiogenesis

30

Most frequently the ectopic pregnancies occur in the:

Ampulla off the uterine tube

31

What is the most sensitive period of development of the fetus?

3rd to 8th week

32

Which proteins controls cell invagination in gastrulation?

FGF8

33

What is not a congenital malformation due to rubella virus?

A. Cataract
B. Heart defects
C. Deafness
D. Glaucoma

E. mental retardation

34

What is the main function(s) of the placenta ?

A. Transmission of maternal antibodies
B. Hormone production
C. Exchange of gases
D. exchange of nutrients and electroytes
E. all of the above

35

What is the only monosomy compatible with life?

Turner Syndrome

36

Which of the hormones may be important for establishment of right sidedness?

Snail

37

When is the physiological umbilical hernia completely withdrawn into the body of the embryo?

end of 3rd month

38

On what day does the primitive streak clearly visible?

15-16 day

39

How long is a pregnancy?

266 days, 38 weeks after fertilization

40

Which of the following is NOT a fetal membrane?

A. chorion
B. yolk sac
C. amnion
D Heuser’s membrane

41

What is not a structure of tertiary villus in the 3rd week?

A. capillaries
B. intervillous space
C. cytotrophoblasts
D. spiral artery

42

Which of the structures does NOT derivate from the mesoderm germ layer?

A. Urinary bladder

43

At what day does the neural tube approximately close?

Cranial part at day 25th, caudal part at day 27th

44

What is the rate for monozygotic twins?

3-4 pr 1000 births

45

What is true about homeobox genes?

- Are transcription factors that contain a homeobox
- Important for pattering of embryonic axis
- Helps establishing different regions of the brain
- Plays a role in determining the origin and type of gut derivatives

46

Why will a fetus born early in the sixth month have difficulties surviving?

The coordination between the respiratory system and CNS is not well established