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Sinuses-

Sinuses merrills

QuestionAnswer
Name the Sinuses. Frontal, Sphenoidal, Ethmoidal, Maxillary,
When do the Maxillary sinuses normally develop? At birth
Usually by the age of 6-7 yrs, the ______ and ______ sinuses are distinguishable from the Ethmoidal. Frontal, Sphenoidal
When are all the sinuses completely developed? By 17 or 18
What is the largest of all sinuses? Maxillary
What are the second largest of all the sinuses? Frontal
These sinuses are divided into 3 main groups. Name the sinuses and the groups. Ethmoidal, Anterior, Middle, Posterior
What sinuses set just below the Sella Turcica? Sphenoidal
All sinuses must be done in an _______ position. WHY? Upright, demonstrate the presence or absence of fluid, and differentiate between fluid and pathology
What bone contains the ethmoidal sinuses? Ethmoid
The most effective way to protect the patient from radiation while having sinus x-rays is ???? Collimation!!!
On a lateral projection of the sinuses, what line is perpendicular to the IR? IP
What line must be horizontal on the lateral sinuses? IOML
Where is the CR directed for a lateral sinus projection? Horizontally entering 1/2 to 1 in posterior to the outer canthus
What should bee seen on the Lateral Sinus projection? All 4 sinus groups, superimposed orbital roofs and mandibular rami, no rotation of sella turcica
When do you use a 72 in distance for a lateral sinus projection? When the patient is having preoperative measurements
On a PA Axial(Caldwell) projection of the sinuses(Vertical Grid), the ______ will form an angle of _____ degrees with the central ray. OML, 15
Where is the CR directed for a Caldwell projection of the sinuses? Horizontally to exit the Acanthion
What should be in the lower 1/3 of the orbits on a PA Caldwell sinus projection? Petrous ridge
When a vertical angled grid is available for a PA Axial projection, how many degrees should it be angled? 15
What projection of the sinuses are the Frontal and Ethmoidal sinuses best seen? PA Axial(Caldwell)
When doing a Waters view of the sinuses, what line is perpendicular to the IR? MML
The ______ forms a _____degree angle with the IR when doing a Waters view of the sinuses? OML, 37
What must be projected inferior to the maxillary sinuses when doing a Waters view of the sinuses? The Petrous Pyramids
Where is the CR directed for a Waters view of the sinuses? Acanthion
What is the purpose for doing an open mouth Waters view of the sinuses? To visualize the sphenoidal sinuses
What projection is used to best visualize the Maxillary sinuses? Waters
Where does the CR exit on an open mouth Waters view of the sinuses? Acanthion
On an SMV projection of the sinuses, what is best visualized? Sphenoid and ethmoidal air cells
Where is the CR directed for an SMV projection of the sinuses? Horizontally and perpendicular to the IOML. Enters approximately 3/4 in anterior to the level of the EAM
On what projections are the Maxillary sinuses visualized? Lateral, Waters
On what projections are the Ethmoidal sinuses visualized? Lateral, Caldwell, SMV
On what projections are the Sphenoidal sinuses visualized? Lateral, Open mouth Waters, SMV
On what projections are the Frontal sinuses visualized? Lateral, Caldwell
What are some of the functions of the sinuses'? Resonating chamber for voice, Make skull lighter, Help warm and moisten air, Shock absorber for trauma, and immune system control
The foramen ________ is best demonstrated on what view of the sinuses? Rotundum, Waters view
If improper positioning is done on a Waters view, the _________ __________ are superimposed on the maxillary sinuses. Petrous ridges
On an open mouth Waters view, the _____ will not be perpendicular to the IR. MML
Created by: radgirl37
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