Hand
 

I've been modifying the hand to do a few new things ... in particular first to make the fingers ab/adduct as well as flex and extend. This was easy by writing a routine that sets Euler rotations on the appropriate joints after applying motion constraints (min/max angles, etc.).

I'd like to make the thumb a bit richer, but am having trouble figuring out how to access the metacarpal ... these bones inside the hand can be ignored for the other fingers, but for the thumb this bone has a lot of motion. Is this bone somewhere in the list?

I believe the thumb metacarpal can be accessed through the bone called "bone thumb ROOT".