Which of the following muscle spindle fibers provides information about a muscle's velocity of change?
A) dynamic nuclear bag fibers
B) nuclear chain fibers
C) static nuclear bag fibers
D) dynamic nuclear chain fibers

Question

Quizplus · Accepted Answer

Dynamic nuclear bag fibers are specialized muscle spindle fibers that are sensitive to the velocity of muscle fiber lengthening or shortening, as well as the rate and direction of movement. They provide information about the speed of muscle contraction and are important for fine motor coordination and control. The other options, (B) nuclear chain fibers, (C) static nuclear bag fibers, and (D) dynamic nuclear chain fibers, provide information about muscle length, muscle tension, and the position of the limbs respectively, but not specifically about velocity of change.

Which of the Following Muscle Spindle Fibers Provides Information About