Neurologist Frank R. Wilson once called the hand "the outside part of the brain." When the hand moves, it reveals our thoughts. There are two dominant motion patterns that govern human interaction:
This is the realm of the ulnar side of the hand (the pinky side). In a power grip—whether swinging a tennis racket or carrying a suitcase—the fingers wrap around an object while the wrist stabilizes. The thumb acts as a clamp, pressing against the radial side. The motion is coarse, driven by large forearm muscles, and prioritizes endurance over speed. arm and hand in motion
How does a muscle in your forearm move a bone in your finger? The answer lies in the fascinating system of tendons. Neurologist Frank R
Muscles only contract (shorten). To extend your fingers, you don't have muscles on the top of your hand that push the fingers open. Instead, you have muscles in your forearm that pull long tendons—like strings on a marionette—running over the wrist and knuckles. In a power grip—whether swinging a tennis racket
A ball-and-socket joint that allows for 360-degree rotation, providing the "global" reach necessary to position the hand.