Which of the Following Lines Must Be Perpendicular to the IR

question 95

Multiple Choice

Which of the following lines must be perpendicular to the IR for the AP "open mouth" atlas and axis?

• A) Glabellomeatal line
• B) Orbitomeatal line
• C) Acanthiomeatal line
• D) A line drawn from the lower edge of the upper incisors to the tip of the mastoid process

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