What are the four small radiopaque bony crests imaged at the midline of the mandible called?
What will be an ideal response?
Genial tubercles. These tubercles serve as muscle attachments. Because of their proximity to each other, they appear as one round radiopaque "doughnut" at the midline beneath the apices of the central incisors.
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Which of the following BEST describes an extension ladder?
A. Equipped with folding hooks that anchor the ladder over the ridge of a pitched roof B. Designed to be used as a self-supporting stepladder, equipped with positive locking devices C. Comprised of a base section and one or more fly sections, can be adjusted to specific length needed D. Designed with hinged rungs that allow the ladder to be folded so that one beam rests against the other
The ________ cavity lies posterior to (behind) the peritoneal cavity
A. retroperitoneal C. abdominal B. electrolytic D. thoracic