Sinus/Orbits Quiz

Question 1

The pariteoacanthial (waters) projection is often modified so there is less angulation of the orbits. For this modification, the OML forms an angle of ______________ degrees to the IR.

a.) 30
b.) 56
c.) 37
d.) 50

Answer 1

d.) 50

Question 2

The tear duct passes through a foramen in which bone?

a.) maxilla
b.) lacrimal
c.) zygomatic
d.) nasal

Answer 2

b.) lacrimal

Question 3

Where does the CR exit for a modified parietoacanthial (modified waters) projection of the sinuses?

a.) glabella
b.) nasion
c.) acanthion
d.) midorbits

Answer 3

c.) acanthion

Question 4

Which positioning line is placed perpendicular to the plane of the image receptor for the parietoacanthial (waters) projection ?

a.) lips-meatal
b.) orbitomeatal
c.) acanthiomeatal
d.) mentomeatal

Answer 4

d.) mentomeatal

Question 5

The two smallest bones in the skull are the:

a.) lacrimal
b.) vomer
c.) ethmoid
d.) sphenoid

Answer 5

a.) lacrimal

Question 6

The _________ is located in the apex of the orbit.

a.) optic nerve
b.) inion
c.) sella turcica
d.) superior orbital fissure

Answer 6

a.) optic nerve

Question 7

The CR for a PA caldwell of the sinuses is:

a.) 25 degrees caudal
b.) 0 degrees
c.) 30 degrees cephalad
d.) 15 degrees caudal

Answer 7

b.) 0 degrees

Question 8

The roof of the orbit is formed mostly by the:

a.) frontal
b.) lacrimal
c.) maxilla
d.) ethmoid

Answer 8

a.) frontal

Question 9

The last sinus to develop is the:

a.) frontal
b.) maxillary
c.) ethmoid
d.) sphenoid

Answer 9

c.) ethmoid

Question 10

The primary purpose of the orbit is:

a.) provide a socket for the eyeball
b.) provides our vision
c.) forms part of the face

Answer 10

a.) provides a socket for the eyeball

Question 11

The degree of angulation for a PA caldwell of the orbits is:

a.) 30 degrees caudal
b.) perpendicular
c.) 30 degrees cephalic
d.) 15 degrees caudal

Answer 11

a.) 30 degrees caudal

Question 12

A radiograph of a lateral projection of the facial bones reveals that the mandibular rami are not superimposed (one ramus is anterior to the other). What specific positioning error is present on this radiograph?

a.) tilt
b.) excessive flexion
c.) rotation
d.) excessive extension

Answer 12

c.) rotation

Question 13

A fracture that involves the maxilla, orbit, and zygomatic arch is called:

a.) blowout
b.) tripod
c.) depressed
d.) basal skull

Answer 13

b.) tripod

Question 14

The frontal sinuses are seen best on which projection?

a.) lateral
b.) waters
c.) smv
d.) pa caldwell

Answer 14

d.) pa caldwell

Question 15

Which of the following is true regarding positioning for the waters method?
1.) the orbitomeatal line forms a 37 degrees angle with the plane of the cassette
2.) the mentomeatal line is perpendicular to the cassette plane
3.) the coronal plane is perpendicular to the cassette plane

a.) 1, 2 and 3
b.) 1 and 3
c.) 2 and 3
d.) 1 and 2

Answer 15

d.) 1 and 2

Question 16

Which sinus is occasionally absent?

a.) ethmoid
b.) sphenoid
c.) maxillary
d.) frontal

Answer 16

d.) frontal

Question 17

The ________ portion of the eye contain rods and cones that allow light and dark areas to be distinguished.

a.) iris
b.) retina
c.) sclera
d.) cornea

Answer 17

b.) retina

Question 18

The maxillary sinuses are located:

a.) in the alveolar process
b.) in the frontal process
c.) in the body of the maxilla
d.) in the maxillary cavity

Answer 18

c.) In the body of the maxilla

Question 19

The lateral wall of the orbit is formed mostly by the :

a.) lacrimal
b.) maxilla
c.) sphenoid
d.) zygoma

Answer 19

d.) zygoma

Question 20

For a modified waters projection of the orbit, where should the petrous lie?

a.) lower third of orbits
b.) below maxillary sinus
c.) within the orbits
d.) below orbits

Answer 20

d.) below orbits

Question 21

Which line should be perpendicular to the IR for a modified waters position?

a.) mml
b.) ipl
c.) oml
d.) lml

Answer 21

d.) lml

Question 22

The upper and lower teeth are embedded in the:

a.) symphisis menti
b.) condyloid processes
c.) palatine processes
d.) alveolar processes

Answer 22

d.) alveolar processes

Question 23

Which of the following structures are described as scroll like projections found in the nasal cavity?

a.) septal cartilage
b.) conchae
c.) pterygoid processes
d.) perpendicular plate

Answer 23

b.) conchae

Question 24

All of the following are clearly demonstrated on the parietoacanthial projection (waters) method, except:

a.) maxillae
b.) zygomatic arches
c.) orbits
d.) foramen magnum

Answer 24

d.) foramen magnum

Question 25

Which sinus is seen in the open mouth waters position?

a.) sphenoid
b.) ethmoid
c.) maxillary
d.) frontal

Answer 25

a.) sphenoid

Question 26

how many bones make up the orbit?

Answer 26

7

Question 27

The two L shaped facial bones that have both horizontal and vertical plates are the:

a.) sphenoid
b.) ethmoid
c.) palatine
d.) mandible

Answer 27

c.) palatine

Question 28

Which set of sinuses contain three compartments ( anterior, middle, posterior)?

a.) spenoid
b.) maxillary
c.) frontal
d.) ethmoid

Answer 28

d.) ethmoid

Question 29

If a patient is correctly positioned for a pa caldwell of the orbits, where should the petrous ridges be?

a.) in the lower half of the orbits
b.) above the orbits
c.) in the lower 1/3 of the orbits
d.) below the orbits

Answer 29

d.) below the orbits

Question 30

At what landmark should the CR be centered for a lateral projection of the orbit?

a.) at the cheekbone
b.) outer canthus
c.) inferior to outer canthus
d.) midway between the outer canthus and eam

Answer 30

b.) outer canthus