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Which plant part are cucurbit tendrils thought to be modified from?

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A pile of freshly harvested pumpkins and gourds in various shapes, with striped patterns in shades of yellow, orange, and green. — Cucurbitales Pumpkins and gourds, order Cucurbitales.

In the plant family Cucurbitaceae, which belongs to the order Cucurbitales, the tendrils are generally regarded by most botanists as being modified shoots. These specialized structures, which serve to support the plant's vining stems, are part of a branch complex and are typically found at the side of the leafstalk.12