Arm And Hand In Motion | [portable]

Not all motion is utilitarian. The arm and hand are also our most expressive social signals.

This is the domain of the median and radial nerves. The pad-to-pad pinch (holding a needle) or the pad-to-side pinch (turning a key) requires the thumb to abduct and oppose. Here, the motion is driven by the small, intrinsic muscles within the hand (the thenar eminence). Watch a calligrapher write: the arm floats above the paper, the wrist barely moves, and the fingers dance in millimeters. That is the triumph of the neuromuscular spindle. arm and hand in motion