Skull positions Flashcards
(31 cards)
What is perpendicular to the IR for a PA skull and all axial caudwell views?
OML and MSP
Where does CR exit for a PA skull?
The glabella
Where does the CR exit for a PA axial caudwell views?
the nasion
How much do you angle for a PA axial caudwell views?
15 degrees
What needs to perpendicular to the IR for the townes view?
OML or IOML
What is the angle of the CR if the OML is perp to the IR for the townes projection?
30 degrees caudad
What is the angle of the CR if the IOML is perp to the IR for the townes projection?
37 degrees caudad
What does the petrous ridge sit in a PA skull projection?
petrous ridge fill the orbits
Where do the petrous ridge sit in a PA caudwell projection?
petrous ridges in the lower 1/2 of the orbits
Where do the petrous ridges and the dorsum sellae in a AP townes projection?
petrous ridges and dorsum sellae within the foramen magnum
Where does the CR enter for the AP townes skull projection?
2 1/2 inches superior to glabella
What is perpendicular to IR and parallel to IR for a lateral skull projection?
IPL perp to IR
MSP parallel to IR
What is perpendicular to the IR for a waters projection?
MML and MSP
what angle does the OML form to the IR on a waters projection?
37 degree angle
What is perpendicular to the IR for a modified waters projection?
LML and MSP
What angle does the OML form to the IR for a modified waters projection?
55 degree angle
Where does the CR exit for waters projections?
acanthion
Where do the petrous ridges sit in a waters projection?
petrous ridges in the lower 1/3 of the maxillary sinus
Where do the petrous ridges sit in a modified waters projection?
petrous ridges sit below maxillary sinuses
Where is the CR centered to for a lateral facial bone projection?
Zygoma
Where is the CR centered to for a lateral nasal bone projection?
perpendicular 1/2 distal to nasion
Where is the CR centered to for a lateral sinus projection?
CR midway between outer canthus and EAM
Where does the CR exit on a PA mandible
CR exits the junction of the lips
What is the angle of the tube for a AP axial mandible if the OML is perpendicular?
35 degrees caudad
