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Chapter 11 Part 5

Chapter 11 Part 5. Temporal Bone Paranasal Sinuses. Petrous Pyramids. Dense portion on temporal bone Houses ___________ ___________. The Ear. 3 Portions External Middle Inner. External Ear. ____________ Tragus __________. Middle Ear. 3 parts ________________

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Chapter 11 Part 5

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  1. Chapter 11Part 5 Temporal Bone Paranasal Sinuses

  2. Petrous Pyramids • Dense portion on temporal bone • Houses • ___________ • ___________

  3. The Ear • 3 Portions • External • Middle • Inner

  4. External Ear • ____________ • Tragus • __________

  5. Middle Ear • 3 parts • ________________ • Tympanic __________ • _____________

  6. Tympanic Cavity • Contains ________________ • Epitympanic recess (Attic) • _______________ • Tympanic cavity proper • Larger • Inferior aspect • _________________ • Passage from middle ear to _______________ • 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 • __________________ • __________________ • Area within the osseous labyrinth

  9. Osseous Labyrinth • 3 parts • _____________ • For hearing • Round window • _____________ • Oval window • ____________________ • For equilibrium

  10. Internal Acoustic Meatus • Area of auditory and facial nerves • _______________best to visualize

  11. Mastoids • Inferior portion of ___________ • Mastoid air cells • Connects to middle ear from ________ by way of the __________ • Due to this direct connection infection can reach ________________

  12. Sinuses • ________________ • Lined with mucus membranes • Surrounding the nasal cavity • All _______________ 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 osteomeatal complex to the nasal cavities

  14. Sinuses Con’t • Maxillary (2) • Frontal (usually 2) • Ethmoid (Many) • Sphenoid (1 or 2)

  15. Maxillary Sinus“Antrum of Highmore” • ________________ • Located in the body of maxillary bones • Lateral to Nasal cavity • Communicates to osteomeatal complex by way of _______________into middle nasal ____________ (Separated by uncinate process of ethmoid)

  16. Frontal Sinus • Located between ______________table of skull in frontal bone • Posterior to glabella • Can have 2 (most common) or 1 large sinus • _______________ • Communicate to osteomeatal complex by Ethmoid sinus through ______________

  17. Ethmoid Sinus • Located within the ethmoid bone _______________ • 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 • Inferior to __________ • Can have ____________ • 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 ½ to 1” off • ________________ perpendicular • OML forms 37° • Mid sagittal line perpendicular • CR to exit ___________________ • Open mouth can show • _________________

  21. PA Caldwell • PA Projection, Upright • __________________ • ______________and OML Perpendicular • Mid sagittal plane perpendicular • CR to exit ______________

  22. Lateral • Right or left site dependant of area of interest or department protocol. Upright • Place pt into anterior oblique • _____________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

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