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Normal Vertebral Mechanics

Quick Quiz 1
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During vertebral flexion of a superior vertebra on an inferior vertebra, the intervertebral facets:
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During vertebral extension of a superior vertebra on an inferior vertebra, the intervertebral facets:
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When we talk about the direction of rotational motion of a vertebra, we will define it by referencing a point on the?
Posterior process.
Anterior surface of the vertebral body.
Transverse process.

A vertebral motion segment is defined by?
Two vertebrae.
Three vertebrae.
Four vertebrae.