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The pathay of communication between the frontal, maxillary, and ethmoid sinuses that provide drainage between these sinus cavities are called...
Which cranial bones contain paranasal sinuses?
Frontal, Ethmoid, and sphenoid
Which sinus lies most posterior?
What sinus best demonstrated on a waters projection?
Ethmoid, sphenoid and maxillary.
Which sinuses are viewed in a lateral view?
- All four sinuses.
- Ethmoid, sphenoid, maxillary and frontal.
What sinuses are viewed in the caldwelll?
Maxillary, ethmoid and frontal
What sinuses do you see in an SMV?
Sphenoid, Ethmoid, Maxillary.
What sinuses do you see in an open mouth waters?
- All for.
- Sphenoid, ethmoid, maxillary and frontal.
The sphenoid sinus is located anterior and inferior to what structure?
The anterior ethmoid sinuses....
1. appear to fill the orbits in a PA projection.
2. appear to fil lthe orbits in a letral prjection.
3. superimpose the sphenpoid snuses in a pa projeciton
4. lie medial to the orbits in a PA projection
Which ones describe the ethmoid sinuses?
2, 3 and 4
Where are the ethmid air cells contained?
Ethmoid air cells are contained with in the LATERAL SIDEs of the ethmoid bone
It is important to take radiographs in the erect position because for sinuses...
Fluid will remain trapped in the MAXILLARY sinuses in this position.
In what age do the frontal and sphenodi bone develop?
What birth does the ethmoid develop?
7 years and older
What age doe sthe maxillary sinus develop?
How many auditory ossicles reside in the midle ear? What are they?
- Three of them.
- Malleus, Incus and Stapes
What bony projection does the tympanic membrane attach to?
The tympanic membrane attaches to the DRUM CREST.
Where does the tympanic bone attach directly? Howe about the oval window?
Th etympanic membrane is attached directly to the malleus and the oval window is attached to the stapes.
The middle ear has two connections. What are they?
The anterior connection with the nasopharynx is through the esutachain tube.
The posterior is conected through the aditus.
What is the thin plate of bone that seperates the brain from the mastoid area?
Which are in the ear releates to equilibrium and direction?
Which part of the inner ear is reponsible for hearing?
What two winwos are found in the inner ear?
Rouna nd oval windows.
The osseous labrynth is composed of what 3 parts?
Cochlea, Vestibule anfd semicircular canals.
What intercommunicating duct/sac is found in the mebranous labrnyth?
What are the bones 7 bones that compose the orbits?
- 3 Cranials
- - Frontal
- - Sphenoid
- - Ethmoid
- 4 Facial bones
- - Maxilla
- - Zygoma
- - Lacrimal
- - Palatine
The base of the orbit is made up of which 3 bones?
Frontal, Zygoma, and maxillae
What are the two fractures involving the orbit?
Tripod and Blow out fractures.
In a lateral or the AP posetion of hte orbits, each orbit is projected what way?
Superiorly 30 degrees and medially 37 degrees
What sepereates teh superior orbital fissure and the optical canal?
What is the opening between th elsser and greater wings of hte sphenoid in the apex of the orbit?
Superior orbgital fissure
On a 3 point landing position, what 3 parts of the face will make contact with the table?
Zygoma, Nose and Chin.
Which positioning line is perpendicular to the plane of the film when doing orbits?
On a rheese projection, which way will the optic foramen project?
It proejcts to the lower, outer area of the orbit
In amodififed waters view, What asngle does the OML form? Where is the CR directed?
55 degree angle with CR directed at the acanthoin
What fracture does the modified waters view best for the orbits?
Blow out fracture.
What forms the TMJ?
Formed by condyle head of the condyloid porocess of mandible.
What type of joint is the TMJs?
What action moves the condyle forward?
Opening your mouth wide
How do you position for the Townes view for TMJs?
35 degree caudal to OML.
How do you position for the laws?
- 15 degree caudal angle with 15 degree body rotation.
- IOML perpendicular to cassette
- Do open and closed mouth.
How do you position for a schullers?
- 25-30 degree caudal at true lateral.
- IOML perpendicular to the IR.
- Do open and closed mouth
What angle does the normal waters form with the OML to IR?
What is the angle a modified waters form by the OML?
For an axiaolateral obliquie projection of trhe mandible, what do you see in a 10-15 degree? 30 degrees? and 45?
- 10-15 you see general seurvey of manidble.
- 30 degrees you see the bod of the mandible
- 45 you see the mentum
What angle do you use in a Townes view of the mandible?
What forms the superiro orbital fissure?
Greater and lesser wing
What is the otpic foramen?
Optic nerve runs through.
Where forms the inferior orbital fissure?
The maxilla, zygoma and greater wing of sphenoid.