Why can whale nerves stretch and turn like bungee cords?

Nerves are extremely delicate structures. They don't tend to be very flexible and can get injured if they are stretched even the slightest bit too much. At the same time, nerves are needed in areas of the body that put up with a lot of lengthening and straining. Here's an extreme example: When it opens its massive mouth to feed, the rorqual whale's nerves stretch to more than double their resting length and back—all while making extremely sharp 'hairpin'-like turns—without being stra