CT temporal bone axial - labeling questions

Case contributed by Dr Craig Hacking
Annotated image

Normal CT temporal bone (with labels)

The labeled structures are (excluding the correct side):

  1. sphenozygomatic suture
  2. styloid process
  3. temporomandibular joint
  4. mastoid air cell
  5. mastoid process
  6. mandibular condyle
  7. clivus­­
  8. cartilaginous external auditory canal
  9. pharyngotympanic tube
  10. stylomastoid foramen
  11. pars vascularis of jugular foramen
  12. occipitomastoid suture
  13. carotid canal
  14. pars nervosa of jugular foramen
  15. hypotympanum
  16. carotid plate
  17. osseous external auditory canal
  18. tympanic membrane
  19. scutum
  20. mastoid segment of the chorda tympani
  21. tensor tympani muscle
  22. mesotympanum
  23. manubrium of the malleus
  24. basal turn of the cochlea
  25. cochlear promontory
  26. petroclival fissure
  27. cochlear duct
  28. apical turn of the cochlea
  29. long process of the incus
  30. round window niche
  31. facial recess
  32. sinus tympani
  33. pyramidal eminence
  34. cochleariform process
  35. posterior (second) genu of the facial nerve
  36. stapes
  37. head of malleus
  38. anterior (first) genu of the facial nerve
  39. short process of the incus
  40. oval window
  41. incudomalleolar joint
  42. middle turn of the cochlea
  43. tympanic portion of the facial nerve
  44. saccule of the vestibule
  45. aditus ad antrum
  46. internal auditory canal (meatus)
  47. utricle of the vestibule
  48. falciform crest
  49. lateral semicircular canal
  50. porus acousticus
  51. mastoid antrum
  52. vestibular aqueduct
  53. posterior semicircular canal
  54. superior semicircular canal
  55. sigmoid groove
  56. occipitomastoid suture
CT

Normal CT temporal bone (without labels)

The same normal temporal bone CT without labels for reference.

Case Discussion

The labeled structures are (excluding the correct side):

  1. sphenozygomatic suture
  2. styloid process
  3. temporomandibular joint
  4. mastoid air cell
  5. mastoid process
  6. mandibular condyle
  7. clivus­­
  8. cartilaginous external auditory canal
  9. pharyngotympanic tube
  10. stylomastoid foramen
  11. pars vascularis of jugular foramen
  12. occipitomastoid suture
  13. carotid canal
  14. pars nervosa of jugular foramen
  15. hypotympanum
  16. carotid plate
  17. osseous external auditory canal
  18. tympanic membrane
  19. scutum
  20. mastoid segment of the chorda tympani
  21. tensor tympani muscle
  22. mesotympanum
  23. manubrium of the malleus
  24. basal turn of the cochlea
  25. cochlear promontory
  26. petroclival fissure
  27. cochlear duct
  28. apical turn of the cochlea
  29. long process of the incus
  30. round window niche
  31. facial recess
  32. sinus tympani
  33. pyramidal eminence
  34. cochleariform process
  35. posterior (second) genu of the facial nerve
  36. stapes
  37. head of malleus
  38. anterior (first) genu of the facial nerve
  39. short process of the incus
  40. oval window
  41. incudomalleolar joint
  42. middle turn of the cochlea
  43. tympanic portion of the facial nerve
  44. saccule of the vestibule
  45. aditus ad antrum
  46. internal auditory canal (meatus)
  47. utricle of the vestibule
  48. falciform crest
  49. lateral semicircular canal
  50. porus acousticus
  51. mastoid antrum
  52. vestibular aqueduct
  53. posterior semicircular canal
  54. superior semicircular canal
  55. sigmoid groove
  56. occipitomastoid suture
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Case information

rID: 63096
Published: 1st Mar 2019
Last edited: 14th Aug 2019
System: Head & Neck
Inclusion in quiz mode: Included

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