Which connective tissue layer contains bundles of muscle fibers?

The connective tissue layer that contains bundles of muscle fibers is the perimysium. This layer surrounds groups of muscle fibers, organizing them into bundles known as fascicles. Each fascicle is made up of multiple muscle fibers, which allows for the coordination of muscle contractions and ensures efficient force generation during muscle activity.

The perimysium also contains blood vessels and nerves that supply the muscle fibers, playing a critical role in the overall function and health of the muscle. This supportive function, along with the structural organization it provides, is essential for the proper contraction and functioning of skeletal muscles.

In contrast, the epimysium is the outermost layer that encases the entire muscle, while the endomysium wraps individual muscle fibers. Understanding these layers and their specific roles is crucial for comprehending how muscles are structured and how they function during physical activity.