Embryology MCQ Flashcards
Vemix caseosa is a fatty substance covering by the end of the intrauterine life:
Skin of the fetus
The buccopharyngeal mebraneis formed by:
Ectoderm and endoderm
Placenta previa result from implantation in:
The region of the internal opening (os) of the cervix
Erythboblastosis is fetalis disease may occur in cases where:
The fetus is RH(+) and the mother is RH(-)
Cotyledons are compartments of:
Umbilical cord
Situs inversus is a condition occurring in approximately 20% of patients with:
Kartagener syndrome
The embryo at the time of implantation is in the :
8-cell stage
Maintaining of structure and function of corpus luteum during the first intrauterine of pregnancy depending on:
hCG
The length of a normal pregnancy is considered to be:
280 days after fertilization
During ovulation extruded from ovary to the uterine tube is the:
Secondary occyte in metaphase
The lens placode is a derivative of:
Ectodermal germ layer
Which one is not the approach used for assisted reproductive technology?
a. ICSI
b. ZIFT
c. OMI
A phenomenon occurring during the third week of development is:
Formation of the notochord
The parenchyma of the thyroid gland develops from the:
Endoderm
Which one is the derivative of somite?
Subcutaneous tissue of the skin
The process of compaction occurs at:
8-cell stage
The secondary yolk sac in an embryo is at age of:
13 days
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
The uteroplacental circulation begins by the end of the:
Secondary week of the development
An abnormal number of sex chromosomes occurs in:
Tumer syndrome
Interior parathyroid gland develops from:
3rd pharyngeal pouch
Vitelline duct:
Connects cavity of yolk sac with midgut
Chorion frondosum has got contact with:
Decidua basalis
Ultimobranchial body contributes cells to:
Thyroid
Which one is a phenomenon occurring during the acrosome reaction?
Release of trypsin-like enzymes and acrosin
Sirenomelia (caudal dysgenesis) results from insufficient formation in the lumbosacral region:
Mesoderm
Which one is a component of the uterus?
Basal layer
Spermatogenesis is a process resulting in the transformation of:
Spermatogonia into spermatozoa
The process of formation of blood vessels by sprouting from existing vessels:
Angiogenesis
Most frequently the ectopic pregnancies occur in the:
Ampulla off the uterine tube
What is the most sensitive period of development of the fetus?
3rd to 8th week
Which proteins controls cell invagination in gastrulation?
FGF8
What is not a congenital malformation due to rubella virus?
A. Cataract
B. Heart defects
C. Deafness
D. Glaucoma
E. mental retardation
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
What is the only monosomy compatible with life?
Turner Syndrome
Which of the hormones may be important for establishment of right sidedness?
Snail
When is the physiological umbilical hernia completely withdrawn into the body of the embryo?
end of 3rd month
On what day does the primitive streak clearly visible?
15-16 day
How long is a pregnancy?
266 days, 38 weeks after fertilization
Which of the following is NOT a fetal membrane?
A. chorion
B. yolk sac
C. amnion
D Heuser’s membrane
What is not a structure of tertiary villus in the 3rd week?
A. capillaries
B. intervillous space
C. cytotrophoblasts
D. spiral artery
Which of the structures does NOT derivate from the mesoderm germ layer?
A. Urinary bladder
At what day does the neural tube approximately close?
Cranial part at day 25th, caudal part at day 27th
What is the rate for monozygotic twins?
3-4 pr 1000 births
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
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
