Playing the piano requires activation of muscles of the upper limbs, neck and ba

Question

Playing the piano requires activation of muscles of the upper limbs, neck and back. To play the keys, the fingers must generate rapid, small movements that vary in force generation to play the keys sometimes very hard (larger amounts of force) and sometimes very soft (very little amounts of force), and everything in betweern. The elbow flexors hold the elbow joint at the same comfortable angle throughout the duration of play, which can last several hours. Additionally, the player must also sit upright at the piano bench for these long durations without the back or neck muscles fatiguing. For piano playing, which muscles would have the fewest fibers controlled by each motor neuron? O Fingers O Elbow flexors O Back O Neck

Explanation / Answer

Each single motor neuron and the muscle fibers it innervates constitute a motor unit.

The axons of the spinal motor neurons supplying skeletal muscle each branch to innervate several muscle fibers, the smallest possible amount of muscle that can contract in response to the excitation of a single motor neuron is not one muscle fiber but all the fibers supplied by the neuron.

In muscles such as those of the hand and those concerned with motion of the eye (ie, muscles concerned with fine, graded, precise movement), each motor unit innervates very few (on the order of three to six) muscle fibers.

so the answer here is muscles of Fingers.

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