Embryology

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Author:
sweetpea281
ID:
37304
Filename:
Embryology
Updated:
2010-09-25 20:45:24
Tags:
Chapter5
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Description:
development of orofacial structures
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  1. what are the three stages of palatal development?
    • primary palate formation
    • secondary palate formation
    • completion of the palate
  2. what is the triangular mass that forms from the intermaxillary segment?
    primary palate
  3. what does the primary palate partially separate?
    the nasal and oral cavities
  4. what does primary palate formation give rise to?
    anterior incisors
  5. what are the bilateral palatal shelves that form from the maxillary processes?
    secondary palate
  6. what do the palatal shelves form from?
    maxillary processes
  7. the palatal shelves grow _____ at first then they ____ _____ and fuse together to form the _____ _____.
    • downward
    • snap upward
    • secondary palate
  8. the tongue has to move from the _____ to the _____ ___ so it doesn't get in the way of the ____.
    • pharynx
    • oral cavity
    • snap
  9. what does secondary palate formation give rise to?
    maxillary canines, posterior teeth, soft palate and uvula
  10. what happens in the completion of the palate?
    the primary and secondary palate fuse
  11. what are the four types of clefting that can happen with the formation of the primary and secondary palate formations?
    • cleft uvula
    • bilateral cleft of secondary palate
    • cleft of the primary palate
    • cleft of both primary and secondary palate
  12. what is the mildest form of clefting?
    cleft uvula
  13. what clefting is it when the palatal shelves don't fuse completely in the back?
    cleft uvula
  14. what kind of clefting is it when the palatal shelves don't fuse to each other?
    bilateral cleft of the secondary palate
  15. what kind of clefting is it when the two palates don't fuse together? explain
    • cleft of the primary palate
    • complete bilateral cleft of the lip and alveolar process with bilateral cleft of the primary palate
  16. what kind of clefting is it when nothing fuses? explain.
    • cleft of both primary and secondary palate
    • cleft of the lip and alveolar process with complete bilateral cleft of the primary and secondary palatal portions
  17. what does the nasal septum develop from and what does it fuse with?
    • develops from the intermaxillary segment
    • fuses with the palate
  18. what does the nasal septum divide?
    divides the nasal cavity.
  19. what causes snoring and other sinus problems?
    deviated septum
  20. where does the development of the tongue all take place?
    pharynx
  21. when does the tongue move to the oral cavity?
    before the snap, must get out of the way
  22. what branch does the body of the tongue come from?
    branchial arch 1
  23. what does the body of the tongue formation start with? and where is it located?
    • starts with the tuberculum impar
    • behind the branchial arch I
  24. two ____ ____ ____ develop on each side of the ______ ____ forming the body of the tongue.
    • lateral lingual swellings
    • tuberculum impar
  25. what fuse and overgrow the tuberculum impar to form the body of the tongue?
    lateral lingual swellings
  26. why do the cells degenerate on both sides of the tongue?
    to free it from the floor of the mouth
  27. true/false. the cells don't degenerate down the middle of the tongue forming the midline lingual freunum?
    true
  28. what is anklyglossia?
    tongue-tied, the midline lingual frenum is too long and restricts the movement of the tongue
  29. what arches does the bas of the tongue form from?
    branchial arch 2 and 4
  30. what forms the base of the tongue and where does it come from?
    • copula
    • branchial arch 2
  31. what comes from branchial arch 4?
    epiglottic swelling
  32. what is the purpose of the epiglottis?
    covers the trachea when you swallow so you don't drown
  33. what is the line down the middle of the tongue? and how is it created?
    • median lingual sulcus
    • lateral lingual swellings fuse
  34. body + base=
    sulcus terminalis
  35. the fusion of the copula is marked by?
    the sulcus terminalis
  36. where is the foramen cecum?
    depression at the back of sulcus terminalis
  37. the ____ ____ is the beginning of the _____ duct.
    • foramen cecum
    • thyroglossal duct
  38. why is the tongue innervated by so many nerves?
    because the tissue came from so many different branchial arches

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