Author Question: The petrous ridges are demonstrated inferior to the maxillary sinuses and extend laterally from the ... (Read 64 times)

ericka1 · **on:** Jul 17, 2018

The petrous ridges are demonstrated inferior to the maxillary sinuses and extend laterally from the posterior maxillary alveolar process on a tangential (superoinferior) nasal bones projection when the

1. GAL is aligned perpendicular to the IR.
2. midsagittal plane is aligned perpendicular to the IR.
3. central ray is aligned parallel with the GAL.
4. central ray is centered to the nasion.
a. 1 only
b. 1 and 3 only
c. 2 and 4 only
d. 1, 3, and 4

Question 2

An optimal PA cranium projection demonstrates all the following except

a. equal distance from the lateral orbital margins to the lateral cranial cortices on both sides are equal.
b. anterior clinoids and dorsum sellae seen inferior to the ethmoid sinuses.
c. petrous ridges superimposing the supraorbital margins.
d. internal acoustic meatus visualized through the center of the orbits.