Question

What are the 3 types of intrafusal muscle fibers?

a) Nuclear bag, nuclear chain, nuclear bar
b) Red, green, blue fibers
c) Slow, fast, intermediate fibers
d) Alpha, beta, gamma fibers

Answer 1

The three types of intrafusal muscle fibers are nuclear bag fibers, nuclear chain fibers, and gamma fibers. These fibers are crucial for proprioception within the muscle spindles.

Step-by-step explanation:

The three types of intrafusal muscle fibers are nuclear bag fibers, nuclear chain fibers, and gamma fibers. These are specialized fibers found within muscle spindles and play a key role in proprioception, which is the sense of the relative position of one's body parts. Nuclear bag fibers are so called because of the nuclei arranged in clumps (or 'bags') within the spindle, nuclear chain fibers have nuclei aligned in single rows, and gamma fibers are actually motor neurons that deal with the sensitivity of muscle spindle response.