Ahhh worth reading the manual as I also found this nugget:

"You can also use curve bends instead of the normal twist/joint/ joint bends. When you set up a joint using curves, the joint will have one twist and one curve primitive. The curve primitive will automatically bend the body part as if that part were part of a curved chain of objects. This feature is very handy for body parts such as tails or antennae.

© 2020-2021 Bondware, Inc. Last updated February 25, 2021 "

This one is from http://www.posersoftware.com/documentation/12/Poser_Reference_Manual/Tools/Joints/Setting_Joint_Orders.htm#h which again I cannot apply a hyperlink to because of my browser.

Eternal Hobbyist