Facial bones Flashcards
all of the following bones comprise the orbit except for the
lacrimal
ethmoid
parietal
sphenoid
parietal
an increased radiopacity seen in the sphenoid sinus on a cross table lateral cranium would most likely indicate a/an
blowout fx
basal skull fx
non - ossification of the sphenoid fontanels
depression fx of adjacent zygoma
basal skull fx
the parietoacanthial projection requires the central ray be directed
perpendicular to OML
Parallel to OML
Perpendicular to MML
parallel to MML
parallel to MML
which of the following sinuses is usually the last to develop
sphenoid
maxillary
frontal
ethmoid
ethmoid
the TMJ is classified as a type of amphiarthroidal, gliding/plane articulation
True
False
False
when performing an AP Axial (caldwell) projection the central ray is directed
25-30 degrees cephalic
25-30 degrees caudal
perpendicular to OML
Perpendicular to IOML
25-30 degrees cephalic
when performing the submentovertical projection, the ___ is adjusted ___ to the receptor
OML/ parallel
IOML / parallel
MML/ perpendicular
IOML/ perpendicular
IOML/ parallel
the crista galli is located within the ___ bone
sphenoid
ethmoid
lacrimal
frontal
ethmoid
the ___ is considered the largest facial bone
maxilla
mandible
frontal
occipital
mandible
the cribriform plate and crista galli are located in the ethmoid bone
true
false
true
which of the following would not be demonstrated on a PA (caldwell) employing a 15 degree angle?
crista galli, inferior orbital margins
crista galli, anterior ethmoid sinus
anterior ethmoid sinus, frontal sinus, crista galli
inferior orbital margins
inferior orbital margins
deviation of the nasal septum is best demonstrated on which of the following projections
lateral
patietoacanthial
SMV
AP axial
parietoacanthial
the first cranial sinus to develop is the
maxillary
ethmoid
frontal
sphenoid
maxillary
a patients skull was positioned in a true lateral position. the central ray was directed at a 25* caudal angle to a point 3” superior and 1” anterior. The anatomy best demonstrated based on this criteria would be the:
mandibular body
mastoids
mandibular rami
temperomandibular articulation
temperomandibular articulation
the patient is PA. The head is rotated so that the MSP forms a 53 degree angle to the IR. What anatomy is best demonstrated
orbital foramen
mandibular condyle
maxillary sinus
nasal septum
orbital foramen
where is the CR directed for the lateral sinus projection
1” posterior and inferior to the outer canthus
1” posterior and superior to outer canthus
1” posterior to outer canthus
at zygoma
1” posterior to outer canthus
when performing the PA axial caldwell for sinuses it is necessary to do which of the following:
angle the tube 15* caudal
angle the tube 25* caudal
elevate the OML 25* from perpendicular
elevate OML 15* from perpendicular
elevate OML 15* from perpendicular
situation: A radiograph of a parietoacanthial (WATERS) projection shows the petrous ridges are projected within the maxillary sinus, is this adequate?
yes
no
no
Situation: A patient with a possible fx of left zygomatic arch enters ER. Neither AP axial nor SMV projection demonstrate left side well. The radiologist is indecisive as to whether this zygomatic arch is fx’d. What other projections can be done
inferosuperior oblique tangential
lateral
ap axial towne’s
parietoacanthial projection (waters)
inferosuperior oblique tangential
Situation: As part of a study of the zygomatic arches, the technologist attempts to perform the SMV position. Because of the size of the patient he is unable to flex his neck adequately to place the IOML parallel to the IR. What other options does the tech have to produce better image?
angle the tube to be parallel to IOML
angle tube perpendicular to IOML
turn pt PA
unable to perform
angle tube perpendicular to IOML
what type of CR angulation should be used for a PA axial projection of mandible?
none
10-15 degree cephalic
20-25 degree cephalic
5 degree cephalic
20-25 degrees cephalic
le forte fx produces a “free floating” zygomatic bone
true
false
false
which of the following factors prevents superimposition of the ramus on the cervical spine for the axiolateral oblique mandible projection
extend the chin
rotate the head towards IR
angle CR 10-15 degrees cephalic
have pt open mouth during exposure
extend the chin
the anterior fontanel in infants is referred to as ____in adults. While the posterior fontanel in infants is referred to as __ in adults
bregma, lambda
