CT head bone window axial skull base - labeling questions

Case contributed by Dr Craig Hacking
Annotated image

Normal CT head bone window (with labels)

The labeled structures are (excluding the correct side):

  1. sphenopalatine foramen
  2. superior articular process of C1
  3. mastoid process
  4. pterygopalatine fossa
  5. posterior arch of C1
  6. pterygoid process
  7. occipital condyle
  8. pterygomaxillary fissure
  9. styloid process
  10. medial pterygoid plate
  11. basion
  12. temporal process of zygomatic bone
  13. sphenotemporal suture
  14. zygomatic process of temporal bone
  15. mandibular condyle
  16. vidian canal
  17. tubercle of occipital condyle
  18. foramen magnum
  19. greater wing of sphenoid bone
  20. clivus
  21. inferior orbital fissure
  22. cribriform plate
  23. foramen rotundum
  24. hypoglossal canal
  25. spheno-occipital synchondrosis (remnant)
  26. foramen ovale
  27. foramen spinosum
  28. foramen lacerum
  29. carotid canal
  30. jugular spine
  31. pars vascularis of jugular foramen
  32. jugular tubercle
  33. pars nervosa of jugular foramen
  34. condylar fossa (glenoid fossa)
  35. carotid canal
  36. stylomastoid foramen
  37. pharyngotympanic tube (Eustachian tube)
  38. petroclival fissure
  39. supra-orbital foramen
  40. opisthion
  41. crista galli
  42. sphenosquamous suture
  43. sphenoid sinus
  44. external auditory (acoustic) canal
  45. basal turn of the cochlea
  46. pituitary fossa (sella turcica)
  47. apical turn of the cochlea
  48. superior orbital fissure
  49. groove for the clinoid segment of the internal carotid artery
  50. optic canal
  51. petrous apex
  52. porus acusticus
  53. vestibule
  54. anterior clinoid process
  55. lateral semicircular canal
  56. lesser wing of the sphenoid bone
  57. tuberculum sellae
  58. facial canal
  59. pneumatized petrous apex
  60. internal auditory (acoustic) canal
  61. dorsum sellae
  62. posterior clinoid process
  63. vestibular aqueduct (for endolymphatic duct)
  64. calcified incisura of tentorium cerebelli
  65. occipitomastoid suture
  66. superior semicircular canal
  67. posterior semicircular canal
  68. frontal crest
  69. mastoid aircells
  70. median internal occipital crest
  71. sphenofrontal suture
  72. diploic space of frontal bone
  73. groove for the middle meningeal artery
  74. groove for the sigmoid sinus
  75. mastoid part of temporal bone
  76. squamous part of temporal bone
  77. parietotemporal suture
  78. internal occipital protuberance
CT

Normal CT head bone window (without labels)

The same normal head CT bone window without labels for reference.

Case Discussion

The labeled structures are (excluding the correct side):

  1. sphenopalatine foramen
  2. superior articular process of C1
  3. mastoid process
  4. pterygopalatine fossa
  5. posterior arch of C1
  6. pterygoid process
  7. occipital condyle
  8. pterygomaxillary fissure
  9. styloid process
  10. medial pterygoid plate
  11. basion
  12. temporal process of zygomatic bone
  13. sphenotemporal suture
  14. zygomatic process of temporal bone
  15. mandibular condyle
  16. vidian canal
  17. tubercle of occipital condyle
  18. foramen magnum
  19. greater wing of sphenoid bone
  20. clivus
  21. inferior orbital fissure
  22. cribriform plate
  23. foramen rotundum
  24. hypoglossal canal
  25. spheno-occipital synchondrosis (remnant)
  26. foramen ovale
  27. foramen spinosum
  28. foramen lacerum
  29. carotid canal
  30. jugular spine
  31. pars vascularis of jugular foramen
  32. jugular tubercle
  33. pars nervosa of jugular foramen
  34. condylar fossa (glenoid fossa)
  35. carotid canal
  36. stylomastoid foramen
  37. pharyngotympanic tube (Eustachian tube)
  38. petroclival fissure
  39. supra-orbital foramen
  40. opisthion
  41. crista galli
  42. sphenosquamous suture
  43. sphenoid sinus
  44. external auditory (acoustic) canal
  45. basal turn of the cochlea
  46. pituitary fossa (sella turcica)
  47. apical turn of the cochlea
  48. superior orbital fissure
  49. groove for the clinoid segment of the internal carotid artery
  50. optic canal
  51. petrous apex
  52. porus acusticus
  53. vestibule
  54. anterior clinoid process
  55. lateral semicircular canal
  56. lesser wing of the sphenoid bone
  57. tuberculum sellae
  58. facial canal
  59. pneumatized petrous apex
  60. internal auditory (acoustic) canal
  61. dorsum sellae
  62. posterior clinoid process
  63. vestibular aqueduct (for endolymphatic duct)
  64. calcified incisura of tentorium cerebelli
  65. occipitomastoid suture
  66. superior semicircular canal
  67. posterior semicircular canal
  68. frontal crest
  69. mastoid aircells
  70. median internal occipital crest
  71. sphenofrontal suture
  72. diploic space of frontal bone
  73. groove for the middle meningeal artery
  74. groove for the sigmoid sinus
  75. mastoid part of temporal bone
  76. squamous part of temporal bone
  77. parietotemporal suture
  78. internal occipital protuberance
PlayAdd to Share

Case information

rID: 62425
Published: 21st Aug 2018
Last edited: 14th Aug 2019
System: Head & Neck
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.