As well as holding the same Limb Animation rollout as the rest of the limb the Palm has its own, unique functionality. These include the Digit Manager and the Palm Animation rollout. The same controls are available for ankles.
The Palm Animation rollout comprises a single slider called Target Align.
When Target Align is set to 0.0, the palm moves but does not rotate with the IK target; instead, it remains aligned with the last bone on the limb. On a humanoid character, that is the forearm.
Palm has not inherited IK target rotations.
When the Target Align value is set to 1.0 the palm inherits both positions and rotations from the IK target.
Palm has inherited IK target rotations.
Digit controls include a digit manager with advanced digit modifiers.