Chapter 12/13 Temporal Bone Paranasal Sinuses. Petrous Pyramids Dense portion on temporal bone...
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Transcript of Chapter 12/13 Temporal Bone Paranasal Sinuses. Petrous Pyramids Dense portion on temporal bone...
Tympanic Cavity
• Contains Auditory Ossicles• ___________________(Attic)
– Superior aspect
• ________________proper– Larger– Inferior aspect– ________________
• Passage from middle ear to nasopharynx• Equalizes pressure
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
Internal Ear
• Area of hearing and equilibrium
• Contains 2 parts– ______________Labyrinth– ______________ Labyrinth
• Area within the osseous labyrinth
Osseous Labyrinth
• 3 parts– ______________
• For hearing• Round window
– ____________• Oval window
– _____________• For equilibrium
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.
Sinuses
• Air filled _____________– Lined with mucus membranes
• Surrounding the ______________
• All communicate with each other by way of nasal cavity
Osteomeatal Complex
• Area where ___________ is collected
• Made of – _________- Nasal Conchae (Turbinates)– _________ – Spaces between conchae
• From the ____________complex to the nasal cavities
Maxillary Sinus“Antrum 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)
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 _______________
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 ____________
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 _______________
Imaging the sinuses
Routine________________________
• Waters (Parietoacanthial)• PA Caldwell• Right or Left Lateral• SMV• 40” SID• 70-80 kVp
Waters
• Tip of chin on IR Nose _____________• MML Line perpendicular
– OML forms 37°• Mid sagittal line perpendicular • CR to exit ________________
• Open mouth can show– _____________
PA Caldwell
• PA Projection, Upright
• OML ________________– ___________and OML Perpendicular
• Mid sagittal plane perpendicular
• CR to ________________
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 __________________
SMV
• Upright
• Tilt head back so _____________to IR
• Mid sagittal perpendicular
• CR to enter between _________________