English to German Tech/Engineering Computers: Software CAD term

Hello,

This is about a menu option for a CAD system. The context is:

The VIEW/CAD INFO menu option ... opens the CAD INFO dialog box. For complex elements such as trimmed surfaces, information about other geometries (base surface, bounding curves) will also be displayed.

I found bounding box = Zeichenbox, and bounding geometry = Hüllgeometrie, but nothing about bounding curves.

Thanks in advance!
Gabriele