Well, there is already a similar question, but I consider mine to be somewhat different as I am not asking about hair-thin fibers that can act individually. The kind of "hair" that I envision are more alike tentacles that act like functional limbs, with significat more thickness that human hairs.
I believe this solution is more believable than prehensile hair acting as individual fibers.
- Then this things maybe will have a limitated growing and size, in one moment will stop its growing.
- The shape probably will be defined, I said not so malleable, for example all the time will look like tentacles or snakes or like in the shoewed image a hand-like shape.
- With a limited quantity of "appendices" (just look at the images you easily can count these limbs, thing that can not be did with "fiber" hair).
what should be able to do this hair?
The most important thing is be enough flexible and strong for carry little objects like tools maybe even to hit some things.
Being able to control some of this appendices at the same time, maybe bringing problems to locomotive intelligence
But the amaizing secondary function, carry at the least the body weight of the creature with this appendices, using all them together.
Probably de secondary is completly impossible and the first very hard, because usually (but not obligated for this question) are boneless structures and the working of the know tentacles out of water is very insufficient, and things like trunks have a complex biomechanic based on rigid bone structures that support the muscles. But hey I do not know enough for determine it, maybe hidrostatic pressure could help?
Maybe at the end my only solution are literally vertebral spines from the skull.
Things that I did not considered is tension for the neck the moment of be carried or the total weight of the head with this new structures.