Tool Palettes Curve Edit > Reverse Curve > To reverse the direction of a curve

Curve Edit > Reverse Curve

Reverses the parametric (U) direction of a curve, causing the start of the curve to become the end, and vice-versa.

This tool also lets you examine the tangent direction on the curve.

To reverse the direction of a curve

Choose Curve Edit > Reverse Curve .
Click the first curve you want to reverse.

The tangent of the curve is shown at the point where you clicked.

Do any of the following:
Click the and drag along the curve to examine the tangent direction.
Click the or the Reverse Active button in the window to reverse the curve you clicked.
Click the or the Reverse All button in the window to reverse all selected curves.
Click on another curve to add to the selection and repeat step 3.

You can also select all the curves you want to reverse before entering the tool.