Which side's iliocostalis is cited as a synergist with quadratus lumborum during lateral flexion to the right?

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Multiple Choice

Which side's iliocostalis is cited as a synergist with quadratus lumborum during lateral flexion to the right?

Explanation:
When you bend the trunk to the right, the main work comes from the right side’s quadratus lumborum. The iliocostalis on the same (right) side acts as a synergist, providing additional pulling force along the spine to support and stabilize the bend to the right. The left-side iliocostalis wouldn’t aid this motion (it would resist or contribute to a bend to the left), and contracting both sides together tends to extend the spine rather than create a pure rightward bend. So the right side’s iliocostalis is the synergist for rightward lateral flexion.

When you bend the trunk to the right, the main work comes from the right side’s quadratus lumborum. The iliocostalis on the same (right) side acts as a synergist, providing additional pulling force along the spine to support and stabilize the bend to the right. The left-side iliocostalis wouldn’t aid this motion (it would resist or contribute to a bend to the left), and contracting both sides together tends to extend the spine rather than create a pure rightward bend. So the right side’s iliocostalis is the synergist for rightward lateral flexion.

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