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Skull practice quiz

QuestionAnswer
What is the name of the point where the 2 parietals articulate with the occipital bone? Lambda
On a lateral projection of the cranium, what is the error indicated by superior and inferior separation of symmetric horizontal structures such as the orbital roofs (plates) and mandibular bodies: tilt
Where is the CR centered for a lateral projection of the sinuses? Midway between the outer canthus and the EAM
What is the posterior portion of the sella turcica? Dorsum sellae
Where does the CR exit for a PA axial projection of the mandible? Acanthion
The cribiform plate is part of which bone? Ethmoid
Where is the CR centered for a lateral projection of the cranium? Caldwell method with 25 to 30 degrees caudad angulation
Which bone is involved with a tripod fracture? Zygomatic
What is the angle between the OML and the plane of the image receptor for the parietoacanthial (Waters) projection? 37 degrees
Which sinus often produces an air/fluid level indicating a basilar skull fracture? Sphenoid
To demonstrate the mentum of the mandible, head is rotated: 45 degrees
The superior most aspect of the skull: vertex
Which of the following cranial bones does not articulate with the parietal bone? Frontal Sphenoid Occipital All of the above articulate with the parietal bone
situation: A radiograph of a parietoacanthial (Waters) projection for sinuses reveals that the petrous pyramids are projected over the maxillary sinuses. What positioning error is present on this radiograph? Excessive flexion
What is the angle between the midsagittal plane and the image receptor for a parieto-orbital oblique projection of the optic foramen? 53 degrees
Which facial bone forms the majority of the hard palate? maxilla
Which projection will best demonstrate the entire mandible with one exposure? Submentovertex
Which positioning line is placed perpendicular to the plane of the image receptor for the parietoacanthial projection? Mentomeatal
Which sinuses are best demonstrated with the PA projection? Frontal and ethmoid
Which positioning line is perpendicular to the image receptor for a PA projection of the mandible? OML
What CR angle is required for the Schuller method projection of the TMJs? 25 degrees to 30 degrees caudad
Which of the following bones is part of the floor of the cranium? Temporal Occipital Frontal Parietal Temporal
Which views demonstrates the sphenoid sinuses: Lateral position SMV projection Parietoacanthial transoral projection
How much skull rotation (from a lateral position) is required to place the ramus parallel to the image receptor for the axiolateral oblique projection of the mandible None (keep skull in lateral position)
For lateral skull: MSP is parallel to IR Interpupillary line perpendicular to IR IOML perpendicular to the front edge of IR
Which projection would best demonstrate the frontal bone? PA Caldwell projection
Which Radiographic line is placed perpendicular to the image receptor for a true lateral projection of the skull? Interpupillary
Where is the CR centered for a lateral projection of the facial bones? Zygoma, midway between the EAM and the outer canthus
What CR angle is required for the AP axial projection for the temporomandibular joints (TMJs) with the IOML perpendicular to the image receptor? 42 degrees
The Submentovertex projection requires that the IOML is placed parallel to the image receptor. true
For modified Waters method, which line is perpendicular to IR: LML
For Rhese method, head is rotated: 37 degrees towards the affected side
Which view of the skull allows visualization of the entire orbital margin? PA with 25-30 caudad angle
Which projection would best demonstrate a basilar skull fracture with blood present in the sphenoid sinus: Horizontal beam lateral projection
Which specific positioning error is present if the mandibular rami are not superimposed on a lateral skull radiograph? Rotation
Which projection best demonstrates the floor of the orbits? Modified parietoacanthial (modified Waters)
Which sinus is projected through the oral cavity with a parietoacanthial transoral projection? Sphenoid
in an AP axial (Towne) projection, what error has occurred if the dorsum sellae is projected above the foramen magnum? Underangulation of CR
 

 



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