Embryo 4

Front 1

The primitive streak first appears at the beginning of the

Back 1

c) third week

Front 2

2. After folding of the head region, the structure lying just caudal to the pericardial cavity is

Back 2

c) septum transversum

Front 3

3. Which of the following structures is believed to be a primary organiser or inducer duringorganogenesis?

Back 3

c) notochord

Front 4

4. Somites:

Back 4

a) arise from segmentation of lateral regions of the neural tube

b) differentiate into myotomes which give rise to skeletal muscle in trunk and limbs

c) differentiate into sclerotomes which give rise to vertebrae

d) arise from segmentation of the paraxial mesoderm

Front 5

5. Main components of the cardiac jelly are:

Back 5

e) adherons

f) proteoglycans

Front 6

6. Of the following, the one most closely associated with the development of portal vein is

Back 6

f) right vitelline vein

Front 7

7. Zona pellucida surrounds the

Back 7

c) oocyte

d) zygota

Front 8

8. The fetal right atrium is mainly derived from:

Back 8

e) sinus venosus

Front 9

9. Of the following, the one most closely associated with development of the oviduct is:

Back 9

d) paramesonephric duct

Front 10

10. The ureteric bud appears as an outgrowth from the:

Back 10

a) mesonephric duct

Front 11

11. Which of the following gives rise to the labia majora?

Back 11

c) genital swellings

Front 12

12. Growth basiely is:

Back 12

b) the increase of the cell number, size and extracellular matrix

Front 13

13. Amniotic fluid contains:

Back 13

b) foetal urine

f) desquamated foetal epithelial cells

Front 14

14. Embryologically, each uriniferous tubule consists of two parts which become confluent at the junction of the:

Back 14

e) distal convoluted tubule and the collecting tubule

Front 15

15. The process of transformation of a spermatid into a spermatozoan is called as:

Back 15

e) spermiogenesis

Front 16

16. The normal amount of amniotic fluid is:

Back 16

b) ~900ml (800-1000ml

Front 17

17. The early stages of cleavage are characterised by

Back 17

d) increase in the number of cells in the zygote

Front 18

18. The derivates of primary urogenital sinus are:

Back 18

a) female urethra

b) lower vagina ?

c) pars prostatica of male urethra

Front 19

19. Placenta develops from:

Back 19

d) trophoblast

Front 20

20. Which of the following structures are derived from migrating cells of neural crest?

Back 20

a) dorsal root ganglion

d) pia mater

Front 21

21. Which of the following hormones is marker of down syndrome?

Back 21

c) human chorionic gonadotropin

e) alpha-fetoprotein

Front 22

22. Acrosome basically is:

Back 22

b) extracellular material, surrounding anterior region of the head of spermatozoa

d) organelle that develops in the anterior part of the head of spermatozoa

Front 23

23. The differentiation of epidermis into 5 layers is finished at:

Back 23

c) 4,5 month (in the book it says by the 4th month it begins)

Front 24

24. Amniotic fluid is replaced every:

Back 24

d) 3 hours

Front 25

25. Ingrowth of sensory nerves in the developing dermis starts from

Back 25

b) 8th week

Front 26

26. Which of the following about development of vertebral column are correct?

Back 26

a) mesenchymal stage of development starts at 4th week

c) during resegmentation of the caudal half of each sclerotome fuses with cephalic half ofeach subjacent sclerotome

Front 27

27. Aging of the placenta includes

Back 27

b) appearance of numerous sinusoids

d) deposition of fibrinoid

Front 28

28. Branching of the uretic bud is regulated by:

Back 28

a) BMP

b) Wnt (-Wnt-11 & BMP7

Front 29

29. Motility of spermatozoa is:

Back 29

b) 2–3 mm per minute

Front 30

30. The components of functional mesonephritic unites are:

Back 30

a) glomeruli

c) mesonephric tubules

e) mesonephric ducts

Front 31

31. Peridermal cells

Back 31

b) derives from ectoderm

d) protect embryo (they are responsible for the exchange of water, so in a wayprotective?)

Front 32

32. The conducting system of the heart develops from:

Back 32

f) splachnopleura (the mesenchyme of it)

Front 33

33. Gastrulation basiely is:

Back 33

d) formation of three germ layers

Front 34

34. The ovulated mammalian oocyte is arrested at:

Back 34

d) metaphase of meiosis II

Front 35

35. The bilaminar germ disk

Back 35

b) forms the embryo proper

Front 36

36. The primitive streak:

Back 36

e) is the site of invagination of epiblast cells to form mesoderm

Front 37

37. Which of the following is NOT a component of the mature placental barrier?

Back 37

c) the cytotrophoblast

Front 38

38. The cardinal veins drain directly into the:

Back 38

f) sinus venosus of the heart tube (together with vitelline and umbilical veins => formsthe brachiocephalicus)

Front 39

39. Of the following, the one most closely associated with the efferent ducts of the testis is:

Back 39

a) mesonephric tubules

Front 40

40. What is the result of cortical reaction?

Back 40

a) sperm can no longer enter the egg

Front 41

41. Which of the following about paraxial mesoderm are correct?

Back 41

c) is programmed to form different vertebrae

Front 42

42. Human chorionic gonadotropin is produced by:

Back 42

c) hormonally active cells of peripheral trophoblasts

Front 43

43. The skull develops from:

Back 43

a) prechordal mesoderm

b) mesoderm of the 1st and 2nd branchial arches

c) unsegmented head mesectoderm

d) four cranial somites

Front 44

44. Which of the following about heart development are correct?

Back 44

b) during embryo lateral folding two endocardial tubes fuse to a single endocardial tube

d) the conducting system derives from the mesenchyme of the splachnopleura

Front 45

45. Which of the following are derived from the surface celomic epithelium of gonadal ridge?

Back 45

e) follicular cells of the ovary

Front 46

46. Cardiac jelly contains:

Back 46

c) fibronectin

d) adherons

e) proteoglycans

Front 47

47. Adrenal gland develops from

Back 47

a) neural crest

e) mesodermal cells

Front 48

48. The growth and branching of ureteric bud is regulated by:

Back 48

e) glial derived neurotropic factor (GDNF)

Front 49

49. The urine production begins in the:

Back 49

c) 11th week

Front 50

50. Craniosynostosis is:

Back 50

a) premature closure of the sutures between bones