Embryology Quiz

What is not a structure of tertiary villus in 3rd week? (I have no idea)

• Capillaries

• Intervillous space

• Cytotrophoblast

• Spiral artery

• Syncytiotrophoblast

Which of the structures does not derive from the mesoderm germ layer?

• Urinary bladder

• Spleen

• Vascular system

• Kidneys

• Somitomers

At what day does the neural tube approximately close?

• Cranial part at day 25, caudal part at day 29

• Cranial part at day 27, caudal part at day 27

• Cranial part at day 27, caudal part at day 29

• Both at day 25

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

What is the rate for monozygotic twins?

• 3-4 per 100 births

• 3-4 per 1000 births

• 3-4 per million births

• 3-4% of the population

• 7-11 per 1000 births

What is true about homeobox genes?

• Are transcription factors that contain a homeobox

• Important for patterning of embryonic axis

• Helps establishing different regions of the brain

• Plays a role in determining the origin and type of gut derivatives

• All of the above are correct

Why will a fetus born early in the 6th month have difficulties surviving?

• The lungs haven’t started to develop

• The digestive system is not fully developed

• The coordination between the respiratory system and CNS is not well estabilished

• The subcutaneous layer under the skin is lacking

• The fetus weight is under 2000g

Where does most of ectopic (extrauterine) pregnancy take place?

• Implantation on abdominal cavity

• Ovarian implantation

• Intestinal implantation

• Uterine tube

• Implantation in the region of internal os

Which of the processes do not take place in 3rd week?

• Appearance of somites

• Closure of neural tube

• Tertiary villus begins to form

• Implantation occurs

• The first blood islands appear in mesoderm

What does the groups of GDF (Growth and differentiation factors) include?

• FGF (fibroblast growth factor), WNT, hedgehog, TGFbeta family

• WNT, FGF, hedgehog

• FGF, TGFbeta, hedgehog

• WNT, TGFbeta, FGF

• None of the above is correct

What is an example of genomic imprinting?

• Prader-Willi and Angelman syndrome

• Miller-Deiker and Shprintzer syndrome

• Cri-du-chat syndrome

• Chromosomal trisomy

• Any alteration of germ cell