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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. From What embryonic layer does the thyroid follicular cells arise?






2. Where is the apical ectodermal ridge?






3. During what week do the limbs begin to form?






4. Where is sonic hedgehog gene produced? What axis is it responsible in patterning?






5. What hormones are in charge of external genitalia development in the fetus? (in both male and female)






6. From where does the ureteric bud arise? What does it give rise to?






7. What is the physiological herniation that occurs at the 6th week - what herniates out of the umbilical ring? when it comes back in the 10th week - What does it rotate around?






8. When does organogenesis occur?






9. What embryological structure gives rise to the trabeculated parts of the left and right ventricle?






10. What do the arches of the branchial apparatus correlate to?






11. From where is the allantois formed? During what week?






12. Where is the mothers blood located in the placenta?






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






14. From What embryonic layer do the ANS arise?






15. What is a teratogen that causes Ebsteins anomaly? What is ebsteins anomaly?

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16. What is contained in the umbilical cord?






17. What embryological structures give rise to the SVC?






18. What part of the gut rotates around the SMA? and At what point?






19. What axis is Wnt 7 responsible for developing?






20. When does hcG get secreted? What does it do?up until when ?






21. When does the notochord form? and When does the neural plate form?






22. From where to Where is the foregut derivative? midgut? hindgut?






23. Where does fertilization occur?






24. From what region of the brain does the aqueduct form?






25. What teratogens can cause discolored teeth?






26. Cleft lip is a failure of fusion of ________ and ______.






27. what results if they dont? What can increase the risks of this?






28. 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?






29. What is the female remnant of the gubernaculum? male remnant?






30. What role does the placenta have?






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






32. Where is the most common ectopic thyroid tissue?






33. What does the ureteric bud interact with and What does it induce it to become?






34. What type of blood do umbilical veins carry? From where to where?






35. failure to close of what fold results in sternal defects? omphalocele? gastrochisis? bladder extrosphy?






36. Pyloric stenosis is characterized by _____________ of muscularis externis in the sphincter






37. What are the two components of the placenta? From What do they form? which one secreted hcG?






38. What is hypoplasia? is primordial tissue present?






39. What is the kidney that functions at the interim kidney in the 1st trimester? What does it later contribute to?






40. From What embryonic layer do CNS neurons arise?






41. What is used to keep the PDA open?






42. What axis does the alar plate form? what neural system does it become?






43. From What embryonic layer is the eustachian tube from?






44. By what week is there fetal movement?






45. What causes the degeneration of the spinal cord in syringomelia?






46. From where does pons form from? what else forms from there?






47. Cleft lip is a failure of formation of the...






48. From what region of the brain does the fourth ventricle form?






49. From What embryonic layer does bone arise ?






50. From What embryonic layer do the parafollicular cells of the thyroid arise?







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