The arches of the hand are the muscular and skeletal structures that allow hand flattening and cupping. The arches direct skilled movements of the fingers and grade the power of the fingers. Well developed hand arches provide an important balance between hand mobility and stability. The hand is considered to have two sides. One side is known as the “power or stability” side (ring and little finger). The “skill or mobility” side is the index and middle fingers working precisely in opposition to the thumb. Intact hand arches provide the foundation for individual finger movements.
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