Question

Where do extrafusal muscle fibers lie?

a) Between muscle spindles
b) Outside the muscle spindle capsule
c) Within the sarcomere
d) In the endomysium

Answer 1

Extrafusal muscle fibers are located outside the muscle spindle capsule and are encompassed by the endomysium, which supplies essential nutrients to the muscle fibers.

Step-by-step explanation:

Extrafusal muscle fibers lie outside the muscle spindle capsule. Within the structural organization of a skeletal muscle, these fibers are surrounded by a thin layer of connective tissue known as the endomysium. The endomysium supports each muscle fiber by providing it with the necessary extracellular fluids and nutrients, which are essential for muscle function and health. These nutrients are supplied to the muscle fibers via the bloodstream which permeates the muscle tissue.