Test your basic knowledge |

USMLE Embryo

Subjects : health-sciences, usmle
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What artery is derived branchial (aortic) arch 2?






2. What part of the fetal comp of the placenta secretes hCG? is this part on the inner or outer layer of the chorionic villi? does it make cells?






3. With the first breath the infant take - pulmonary vasculature resistance _______ which causes an increase in left atrial pressure






4. What artery is derived branchial (aortic) arch 3?






5. From what are the umbilical arteries and veins derived from?






6. What does DHT turn the urogenital folds into? estrogen?






7. What is annular pancreas associated with in infants?






8. What does the maternal component of the placenta provide? Where is it derived from?






9. Which branchial arch derivative is obliterated?






10. what other facial defect other than cyclopia is associated with holoprosencephaly?






11. From What embryonic layer do the ANS arise?






12. What is jejunal - ileal - colonic atresia usually due to? What do you see on x ray?






13. What does the vitelline duct connect? What is it also known as? when should it obliterate?






14. What trisomy is associated with holoprosencephaly? What teratogen?






15. From where does the prostate develop? seminal vesicles? fallopian tube? lower 2/3 of the vagina? ejaculatory duct? epididymis? uterus? upper 1/3 of the vagina?






16. What do the groove/clefts of the branchial apparatus correlate to?






17. what structures are the derivatives of the neural crest cells in branchial arches?






18. What are the two types of posterior fossa malformations? which one results in a hindbrain crowding? and which results in an enlarged posterior fossa? which one is associated with syringomelia?






19. What results in annular pancreas? How does it happen?






20. From what arches are the neural crest cells that form the aorticpulmonary septum derived?






21. What is the effect of teratogens before week 3?






22. WithIn what week does gastrulation occur? What is gastrulation?






23. Which part of pancreas contribute to body? tail? isthmus? accessory pancreatic duct?






24. From where do the three different kidneys come from? Which is the earliest one? is it located most cranially or caudally?






25. From What embryonic layer do CNS neurons arise?






26. From what aortic arch does the common carotid artery arise? what else arises from this arch?






27. What is the effect of teratogens after week 8?






28. What is hypoplasia? is primordial tissue present?






29. Which branchial derivative accounts for taste in the ant 2/3?






30. Cleft palate is a failure of fusion of the lateral palatine processes - the nasal septum and or the ________?






31. What happens in pancreas divisum? what results?






32. From What embryonic layer does the sensory organs of the ear arise?






33. Which branchial derivative creates the epithelial lining of the palatine tonsils?






34. What teratogen can cause an absence of digits amongst other things in the fetus? give an example.






35. From where is amniotic fluid produced? other than electrolytes and carbs - what else does it contain?






36. What day is the chorion formed?






37. From what region does the midbrain form from?






38. What causes a large posterior fossa in a dandy walker malformation? What is found in this fossa?






39. From What embryonic layer does the brain arise?






40. From What embryonic layer do chromaffin cells arise?






41. What does DHT turn the urogenital sinus into? estrogen?






42. What components do the neural crest cells of the branchial arches give rise to?






43. what junction is the last to canalize? what implications does this have down the line?






44. What does the mullerian duct develop into? wollffian?






45. From What embryonic layer is the vagina from? testes? ovaries?






46. From What embryonic layer are the melanocytes from?






47. what bone/cartilage and nerves are derived from branchial arch 1?






48. What does the RET gene encode? what neoplasias is it associated with?






49. What is an arnold chiari II malformation? through what hole does it herniate?






50. Name a syndrome cleft palate is often seen in