Abduction/adduction movements around which axis?

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Multiple Choice

Abduction/adduction movements around which axis?

Explanation:
Abduction and adduction are horizontal eye movements—looking side to side. To achieve that left-right rotation without tilting the eye, the rotation must occur about a vertical axis that runs through the eye. In the axis system used here, that vertical axis is the Z axis. So abduction/adduction are described as rotations around the Z axis. Elevation/depression happen around a horizontal axis (leading to up/down movements), and torsion occurs around the anterior–posterior axis.

Abduction and adduction are horizontal eye movements—looking side to side. To achieve that left-right rotation without tilting the eye, the rotation must occur about a vertical axis that runs through the eye. In the axis system used here, that vertical axis is the Z axis. So abduction/adduction are described as rotations around the Z axis. Elevation/depression happen around a horizontal axis (leading to up/down movements), and torsion occurs around the anterior–posterior axis.

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