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52 terms

chpt 13 facial bones and paranasal sinuses

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Middle Nasal Conchae
Which one of the following bones is not a facial bone?-middle nasal conchae, vomer, lacrimal bone, or mandible
maxilla
what is the largest immovable bone of the face?
frontal, zygomatic, alveolar, palatine
list the four processes of the maxilla
frontal
which one of the four processes of the maxilla is considered the most superior?
acanthion
which soft tissue landmark is found at the base of the anterior nasal spine?
horizontal portion of the palatine bone
which facial bones form the posterior aspect of the hard palate?
frontal and ethmoid
which cranial bones articulate with the maxilla?
zygomatic or malar bones
which facial bones are sometimes call cheek bones?
sphenoid
which of the following bones does not articulate with the zygomatic bone?-temporal, maxilla, frontal, sphenoid
lacrimal bones
which facial bone is associated with the tear ducts?
conchae or turbinates
the purpose of the _____, or ______, is to divide the nasal cavity into compartments and circulate air coming into the nasal cavities.
false
the majority of the nose is formed by the right and left nasal bones.
septal cartilages and vomer
a deviated nasal septum is most likely to occur at the junction between____and____
30, 37
from anterior to posterior, the cone shaped orbits project upward at an angle of ____degrees and toward the midsagittal plane at an angle of ____degrees
inferior orbital fissure
which facial bone opening has the maxillary branch of the fifth cranial nerve passing through it?
superior orbital fissure
which facial bone opening is formed by a cleft between the greater and lesser wings of the sphenoid bone?
optic nerve
what is another term for the second cranial nerve?
antrum of Highmore
what is the older term for the maxillary sinuses?
maxillary
an infection of the teeth may travel upward and involve the _____sinus
between inner and outer tables of the skull
specifically, where are the frontal sinuses located?
6 years
the frontal sinuses rarely become aerated before the age of
labryinths
which specific aspect of the ethmoid bone contains the ethmoid sinuses?
osteomeatal complex
the drainage pathway for the paranasal sinuses is called
sphenoid sinus
which sinus will be projected through the open moth with a PA axial transoral projection?
infundibulum
what is the name of the passageway between the maxillary sinuses and the middle nasal meatus?
true
most CT studies of the sinuses do not require the use of contrast media
prone
which position is most often used when performing a CT study of the sinuses
false
facial bone studies should always be performed recumbent whenever possible
true
the common basic PA axial projection for facial bones requires a 15 degree caudad angle of the central ray, which projects the dense petrous ridges into the lower one-third of the orbits
false
an increase in mAs of 25% to 30% is often required for the geriatric patient with advanced osteoporosis
false
nuclear medicine is not helpful in diagnosing occult facial bone fractures
false
MRI is an excellent imaging modality for the detection of small metal foreign bodies in the eye
blow out fracture
what is the name of the fracture that results from a direct blow to the orbit leading to a disruption of the inferior orbital margin?
tripod
a free floating zygomatic bone is the frequent result of a _____fracture
zygoma
where is the CR centered for a lateral psotion for facial bones
Waters method
what is the proper method name for the parietoacanthial projection of the facial bones
30 degrees
what CR angle must be used to project the petrous ridges just below the orbital floor with the PA axial projection
orbital rims and floors
which structures specifically are visualized better on the modified parietoacanthial projection as compared with the basic waters projection
reduces OID, reduces exposure to the thyroid gland
give two reasons why projections of the facial bones are performed PA rather than AP when possible
mentomeatal line, 37
the waters projection for the facial bones will have the _____ perpendicular to the image receptor, which places the OML at a ___ angle
acanthion
where does the CR exit for a waters projection of the facial bones
nasion
where does the CR exit for the caldwell projection for facial bones
lipsmeatal, 55
the modified waters projection requires that the _____line is perpendicular to the IR, which places the OML at a ____degree angle to the tabletop and IR
true
lateral projections for nasal bones generally are taken bilaterally for comparison
false
the tangential projection for a unilateral zygomatic arch requires that the skull be rotated and tilted 15 degrees away from the affected side
true
both oblique inferosuperior (tangential) projections for the zygomatic arch are generally taken for comparison
maxillary sinuses, inferior orbital rims
for a pa waters projection, the petrous ridges should be projected directly below the ______and projected into the lower half of the maxillary sinuses or below the _____for a modified waters projection
glabelloavelorline or GAL
for the superiorinferior projection of the nasal bones, the IR is placed perpendicular to the ____
zygomatic arches
which specific facial bone structures are best demonstrated with the SMV projection if the correct exposure factors are used
1 in superior to glabella to pass through midarches
where is the CR centered for an AP axial projection for the zygomatic arches?
rhese method, 3 point landing
list the proper method name and the common descriptive name for the parieto-orbital oblique projection for the optic foramen
cheek, nose, chin, 53, acanthiomeatal, lower outer
the three aspects of the face that should be in contact with the head unit or tabletop when beginning positiong for the parieto-orbital oblique projections are the___,_____,and ____. The final angle between the midsagittal plane and th IR should be___ degrees, with the _____line perpendicular to the IR. THis places the optic foramen in the _____quadrant of the orbit