Which layer separates fascicles from each other within a skeletal muscle?

Which layer separates fascicles from each other within a skeletal muscle?

• A. Endomysium
• B. Epimysium
• C. Perimysium
• D. Fascia

Answer: (C)

The key idea is how skeletal muscle is organized into hierarchical connective tissue layers. Muscle fibers group together into bundles called fascicles, and these fascicles are wrapped by a specific connective tissue layer. This layer, the perimysium, forms a sheath around each fascicle and keeps fascicles separate from one another. It also carries larger blood vessels and nerves that supply the fibers inside the fascicle, helping coordinate their activity. In contrast, the endomysium surrounds each individual muscle fiber, the epimysium surrounds the entire muscle, and fascia refers to connective tissue outside the muscle that can surround a muscle or a group of muscles. So the layer that separates fascicles from each other is the perimysium.

The key idea is how skeletal muscle is organized into hierarchical connective tissue layers. Muscle fibers group together into bundles called fascicles, and these fascicles are wrapped by a specific connective tissue layer. This layer, the perimysium, forms a sheath around each fascicle and keeps fascicles separate from one another. It also carries larger blood vessels and nerves that supply the fibers inside the fascicle, helping coordinate their activity. In contrast, the endomysium surrounds each individual muscle fiber, the epimysium surrounds the entire muscle, and fascia refers to connective tissue outside the muscle that can surround a muscle or a group of muscles. So the layer that separates fascicles from each other is the perimysium.