Because tendons need to glide smoothly over joints to create movement, the body utilizes . In your fingers, specifically, there are rings of tissue called annular pulleys. They hold the tendons close to the bone. Without these pulleys, when you tried to make a fist, the tendons would snap away from the bone like a bowstring, reducing power and range of motion.
As the hand moves, thousands of mechanoreceptors in the skin and joints send constant data to the brain. This feedback loop allows for real-time adjustments. If you pick up a carton of milk and find it is lighter than expected, your nervous system adjusts the tension in your forearm muscles mid-motion to prevent you from jerking the carton upward too quickly. Precision vs. Power arm and hand in motion
If the arm is the crane, the hand is the highly dexterous gripper at the end. It is a masterpiece of compact engineering. Because tendons need to glide smoothly over joints
Even common issues like change motion. As the ulnar nerve fails, the ring and pinky fingers claw, and the precision pinch degrades. The hand in motion becomes a map of neural injury. Without these pulleys, when you tried to make
The movement of the arm and hand is made possible by the coordinated effort of multiple joints, muscles, and tendons. The process of movement involves: