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- Translation in a posterior-superior direction followed by anterior rotation of the condyle on the disc; anterior motion of the disc if facilitated by the superior fibers of the lateral pterygoid to prevent impingement in the posterior compartment.
- Muscles: Rotation- suprahyoids/infrahyoids, gravity and relaxation
- Translation- lateral pterygoid inferior head and suprahyoids
First- posterior rotation of the condyle on the disc in the inferior joint. Then there is a translation in the anterior-inferior direction of the disc and condlyle in the superior joint. Retrolaminae disc help maintain stability. Collateral ligaments are taught to hold disc in place.
Temporalis, med pterygoid, superior head of lateral pterygoid
Anterior and inferior translation
Lateral pterygoid, some med pterygoid and masseter if forcible
posterior and superior translation in the upper joint
Temporalis and suprahyoids
Same side spin and opposite side anterior/inferior translation
Opposite med and lat pterygoid and same side temporalis and masseter