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 axis does the basal plate form? what neural system does it become?






2. What components do the mesoderm of the branchial arches give rise to?






3. What artery is derived branchial (aortic) arch 6?






4. The inner layer of the chorionic villi...






5. what muscles are derived from branchial arch 4? CN?






6. what separates the atria from the ventricles?






7. What is duodenal atresia usually due to? What trisomy is it most often seen in?






8. What embryological structure gives rise to the coronary sinus?






9. What arises from the fourth aortic arch?






10. in hypospadias - on which side is the abnormal opening? What causes it?






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






12. What are markers for neural tube defects in the amniotic cavity? CSF?






13. Which branchial apparatus develops into the thymus?






14. What causes persistent Truncus Arteriosus? What does it result in?






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






16. What part of the vagina does the mullerian duct form? Where does the rest come from?






17. What congenital abnormality forms a 'double bubble' on xray?






18. What teratogens can cause discolored teeth?






19. What gene is produced in the zone of polarizing activity?






20. From What do the embryoblast and trophoblast form from? What does the embryoblast split into? the trophoblast?






21. During what months is the fetus most susceptible to teratogens? What trimester?






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






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






24. What are the two walls of the prosencephalon and What do they become?






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






26. What do the 2nd through 4th clefts of the branchial apparatus correlate to?






27. Where does fertilization occur?






28. From what aortic arch does the stapedial artery arise? the hyoid?






29. Which branchial derivative accounts for the posterior 2/3 of the tongue?






30. what chemo drugs can cause neural tube defects in the fetus?






31. From What embryonic layer do CNS neurons arise?






32. What is the mcc of renovascular hypertension in children? What does this predispose to?






33. What is the notochord? What does the notochord later become?






34. What is DiGeorge syndrome and What does it result in?






35. From where does the pulmonary arteries and the ductus arteriosus arise?






36. What effect does warfarin have on the fetus?






37. From what region does the cerebral hemisphere form?






38. From What embryonic layer does the parathyroid arise ?






39. From What embryonic layer is the kidney and the adrenal cortex from?






40. From what branchial derivative do the parafollicular cells arise?






41. Where is the most common ectopic thyroid tissue?






42. What type of - amnios does bilateral agenesis form? What three symptoms does this cause?






43. What embryologic structure provides the aorticpulmonary septum?






44. What are the two components of the fetal component of the placenta?






45. From What embryonic layer is the spleen from?






46. The spleen is ____________ in origin and supplied by a foregut artery






47. From What embryonic layer does the spinal cord arise?






48. From What embryonic layer are the schwann cells from ?






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






50. What is the leading cause of birth defects in the US? what else is this perpetrator the leading cause of?