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Anatomy & Histology · single question

During the initial phase of mandibular opening (first ~25mm), what is the primary condylar movement?

  1. Lateral excursion
  2. Rotation
  3. Both equally
  4. Translation
Show answer and explanation

Correct answer: B. Rotation

First ~25mm of opening = primarily ROTATION of condyle within the glenoid fossa (terminal hinge). Beyond 25mm = translation (condyle moves forward down articular eminence) becomes dominant. Max opening ~45-50mm.

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