Final answer:
A muscle not involved in piano playing would be one that is not associated with the hands or fingers, such as the gastrocnemius in the calf. Injuries to a pianist's hand and forearm bones, like the metacarpals, phalanges, radius and ulna, could significantly interfere with their ability to play the piano.
Step-by-step explanation:
If Sandra is playing the piano for her recital, most of the muscles involved in the movement of her hands and fingers would be those located within the forearm and hand itself.
These include the flexor and extensor muscles which control the bending and straightening of the fingers, as well as intrinsic hand muscles like the lumbricals and interossei that manage fine motor movements and finger coordination.
However, a muscle that is NOT involved in the movement of her hands and/or fingers could be a muscle of the lower body, such as the gastrocnemius, which is one of the major muscles of the calf used in walking and standing. This muscle would not be directly involved in the actions of playing the piano.
In the context of a world-class pianist who gets into a serious car accident, injuries to her hand and forearm bones will most directly interfere with her career as a pianist because these bones support the critical muscles and structures for hand and finger movement.
The metacarpal bones, phalanges (finger bones), and the radius and ulna (forearm bones) are essential for piano playing. Damage to these bones can impair the ability to play by affecting dexterity, strength, and control of the hand and fingers.