The perimysium surrounds what?

• A. A single fiber
• B. A bundle of muscle fibers (fascicle)
• C. The entire muscle
• D. Around blood vessels

Answer: (B)

The perimysium is the connective tissue layer that wraps around a bundle of muscle fibers, called a fascicle. This places it between the innermost layer, the endomysium that surrounds each individual muscle fiber, and the outer layer, the epimysium that surrounds the whole muscle. The perimysium also carries nerves and blood vessels that service the fibers within the fascicle, providing both support and a route for nourishment. So, it best describes surrounding a fascicle—the bundle of muscle fibers. The other descriptions align with different levels of organization: a single fiber is wrapped by endomysium, the entire muscle by epimysium, and while vessels pass through the perimysium, its primary role isn’t to encircle vessels.