Quiz Orbits, Zygoma, Mandible and TMJ

The zygomatic arches are a part of which bone?

 

Frontal

 

Parietal

 

Temporal

 

Sphenoid

Temporal

The largest and most dense bone of the face is the:

 

maxilla.

 

mandible.

 

frontal.

 

sphenoid.

mandible.

The orbit is made up of _____ cranial bones and _____ facial bones.

 

three; four

 

two; five

 

four; five

 

three; two

three; four

For the submentovertical projection of the zygomatic arches, the central ray is directed perpendicular to the _____ line.

 

mentomeatal

 

orbitomeatal

 

infraorbitomeatal

 

acanthiomeatal

infraorbitomeatal

Both zygomatic arches can be demonstrated on one projection for which of the following projections?
1. Tangential
2. SMV
3. AP axial

 

1 and 2

 

1 and 3

 

2 and 3

 

1, 2, and 3

2 and 3

For the tangential projection of the zygomatic arch, the head is positioned so that the midsagittal plane of the skull is _____ degrees _____ the side being examined.

 

10; toward

 

15; toward

 

10; away from

 

15; away from

15; toward

Which line is placed perpendicular to the plane of the image receptor for the AP axial projection of the zygomatic arches?

 

Orbitomeatal line

 

Mentomeatal line

 

Acanthiomeatal line

 

Glabellomeatal line

Orbitomeatal line

What is the central-ray angulation for the PA axial projection of the mandibular rami?

 

15 to 20 degrees cephalad

 

20 to 25 degrees cephalad

 

25 to 30 degrees cephalad

 

30 to 35 degrees cephalad

20 to 25 degrees cephalad

Several methods area available to perform the axiolateral oblique projection of the mandible to demonstrate the symphysis, body, or ramus. What is the central-ray angulation for all of these projections?

 

15 degrees cephalad

 

15 degrees caudad

 

25 degrees cephalad

 

25 degrees caudad

25 degrees cephalad

What is the central-ray angulation for the AP axial projection of the TMJ?

 

25 degrees caudad

 

25 degrees cephalad

 

35 degrees caudad

 

35 degrees cephalad

35 degrees caudad

At which level will the central ray be placed for the SMV projection of the zygomatic arches?

 

Level of the EAM

 

Level of the TMJ

 

Level of the outer canthi

 

At a level 1 inch posterior to the outer canthi

At a level 1 inch posterior to the outer canthi

How is the head positioned to demonstrate the ramus of the mandible in the axiolateral oblique projection?

 

True lateral

 

30 degrees toward the IR

 

45 degrees toward the IR

 

30 to 45 degrees toward the IR

True lateral

How is the head positioned to demonstrate the body of the mandible in the axiolateral oblique projection?

 

True lateral

 

15 degrees toward the IR

 

30 degrees toward the IR

 

45 degrees toward the IR

30 degrees toward the IR

Which two parts of the patient’s face touch the table for a PA axial projection (Caldwell method)? (Select all that apply.)

 

Nose

 

Acanthion

 

Chin

 

Forehead

Nose

Forehead

What 3 structures of the face should touch the IR to help with positioning of the Rheese method for Orbits?

 

forehead, nose, cheek

 

forehead, nose, chin

 

chin, cheek, nose

 

chin, cheek, forehead

chin, cheek, nose

Where should the optic canal/foreman be projected in the orbit?

 

lower inner third

 

upper outer third

 

lower outer third

 

upper inner third

lower outer third

Which of the following projections will clearly demonstrate any medial or lateral displacement of fractures of the mandibular rami?
1.   PA
2.   PA axial
3.   Axiolateral oblique

 

1 & 2

 

1 & 3

 

2 & 3

 

1, 2 & 3

1 & 2

What is the central-ray angulation for the axiolateral projection of the TMJ?

 

15 degrees caudal

 

15 degrees cephalic

 

30 degrees caudal

 

30 degrees cephalic

30 degrees caudal

What projection and anatomy is demonstrated in the image below?

 

AP axial of the TMJs

 

PA axial of the mandibular rami

 

PA of the mandibular body

 

Axiolateral oblique of the mandibular body

PA of the mandibular body

Name the structures in the image below. 

A

C

E

F

A: Frontal sinuses

C: Superior orbital margin

E: Ethmoid sinuses

F: Petrous ridge