Temporal Bone

1
Chapter 12/13

• Temporal Bone
• Paranasal Sinuses

2
Petrous Pyramids

• Dense portion on temporal bone
• Houses
• ______________
• ______________

3
The Ear

• 3 Portions
• __________
• __________
• __________

4
External Ear

• ____________
• Tragus
• EAM

5
Middle Ear

• 3 parts
• ______________(ear drum)
• Tympanic cavity
• Auditory ____________

6
Tympanic Cavity

• Contains Auditory Ossicles
• ___________________(Attic)
• Superior aspect
• ________________proper
• Larger
• Inferior aspect
• ________________
• Passage from middle ear to nasopharynx
• Equalizes pressure

7
Ossicle Articulations

• ________________
• Attached to tympanic membrane
• Receives vibrations and relates to
• _______________
• Transmits vibrations from Malleus and passes on
  to
• _______________
• Smallest
• Transmits vibrations to oval window

8
Internal Ear

• Area of hearing and equilibrium
• Contains 2 parts
• ______________Labyrinth
• ______________ Labyrinth
• Area within the osseous labyrinth

9
Osseous Labyrinth

• 3 parts
• ______________
• For hearing
• Round window
• ____________
• Oval window
• _____________
• For equilibrium

10
Internal Acoustic Meatus

• Area of ______________-nerves
• ____________best to visualize

11
Mastoids

• Inferior portion of Temporal bone
• _____________
• Connects to middle ear from ________ by way of
  the __________
• Due to this direct connection _______ can reach
  mastoid air cells.

12
Sinuses

• Air filled _____________
• Lined with mucus membranes
• Surrounding the ______________
• All communicate with each other by way of nasal
  cavity

13
Osteomeatal Complex

• Area where ___________ is collected
• Made of
• _________- Nasal Conchae (Turbinates)
• _________ Spaces between conchae
• From the ____________complex to the nasal cavities

14
Sinuses Cont

• Maxillary (2)
• Frontal (usually 2)
• Ethmoid (Many)
• Sphenoid (1 or 2)

15
Maxillary SinusAntrum of Highmore

• ____________
• Located in the body of ____________
• Lateral to Nasal cavity
• Communicates to osteomeatal complex by way of
  ______________ into middle nasal meatus
  (Separated by ____________of ethmoid)

16
Frontal Sinus

• Located between inner and outer table of skull in
  frontal bone
• Posterior to ___________
• Can have 2 (most common) or 1 large sinus
• Irregular shaped
• Communicate to osteomeatal complex by Ethmoid
  sinus through _______________

17
Ethmoid Sinus

• Located within the ethmoid bone lateral masses
• Many ________________
• Anterior, middle, posterior collections
• Communicates with the osteomeatal complex
  directly by way of anterior collections and
  drains into ____________

18
Sphenoid Sinus

• Located in the body of the sphenoid bone
• ______________
• Can have 2 or 1 sinus
• Communicates to the osteomeatal complex by way of
  the _______________

19
Imaging the sinuses

• Routine
• ________________________
• Waters (Parietoacanthial)
• PA Caldwell
• Right or Left Lateral
• SMV
• 40 SID
• 70-80 kVp

20
Waters

• Tip of chin on IR Nose _____________
• MML Line perpendicular
• OML forms 37
• Mid sagittal line perpendicular
• CR to exit ________________
• Open mouth can show
• _____________

21
PA Caldwell

• PA Projection, Upright
• OML ________________
• ___________and OML Perpendicular
• Mid sagittal plane perpendicular
• CR to ________________

22
Lateral

• Right or left site dependant of area of interest
  or department protocol. Upright
• Place pt into anterior oblique
• Interpupillary line perpendicular to IR
• ___________to front of cassette
• CR to enter between __________________

23
SMV

• Upright
• Tilt head back so _____________to IR
• Mid sagittal perpendicular
• CR to enter between _________________

24
CT Invasion

• Thin _______________
• Better visualization of _________complex