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. From where does the signal come from to suppress paramesonephric ducts? what stimulates development of the mesonephric ducts?






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






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






4. What separates the ant 1/3 and post 2/3 of tongue?






5. What is the primitive streak? From what layer does it form?






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






7. What produces testis determining factor? what cells are produced from this? and What do they secrete? does this result in?






8. 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?






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






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






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






12. From What embryonic layer does the parathyroid arise ?






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






14. what bone/cartilage and nerves are derived from branchial arch 3?






15. Which part of the chorionic villi can make cells?






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






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






18. What is the allantois become? What is this duct connected to ( on both ends)?






19. What teratogens can cause flipper limbs (limb defects)? What is this drug used for?






20. Where is erythropoeisis in the weeks 3-8 of fetal development? Where does it occur after that? until when?






21. What two things cause VACTERL syndrome?






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






23. Which branchial apparatus derivative makes the tympanic membrane of the ear?






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






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






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






27. From what aortic arch does the first part of the maxillary artery arise?






28. What is associated with only one umbilical artery?






29. From where is the pancreas derived? the spleen?






30. By what week is the neural tube supposed to be closed? when did it start forming?






31. Which CN accounts for the anterior 2/3 of the tongues sensation and pain? how about taste?






32. what bone/cartilage and nerves are derived from branchial arch 2?






33. Which arches form the posterior 1/3 of the tongue?






34. 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?






35. What is hypoplasia? is primordial tissue present?






36. From What embryonic layer does the epithelial linings of the oral cavity arise?






37. From What embryonic layer do the ANS arise?






38. What does DHT turn the labioscrotal swelling into? estrogen?






39. What is another name for the mesonephric duct? paramesonephric?






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






41. 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?






42. Which CN allows for taste and sensation in the posterior 1/3 of the tongue? how about the very back ?






43. As a horseshoe kidney ascends during kidney development - What do they get trapped under?






44. Before birth - blood entering the LA is less than...






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






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






47. What artery is derived branchial (aortic) arch 1?






48. In order to survive tricuspid atresia - What do you need?






49. From What embryonic layer is the bladder and urethra from?






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