Which layer surrounds a single muscle fiber?

Which layer surrounds a single muscle fiber?

• A. Surrounds a single muscle fiber
• B. Surrounds a fascicle
• C. Surrounds the entire muscle
• D. Surrounds blood vessels

Answer: (A)

Endomysium wraps each individual muscle fiber. This thin connective tissue layer separates neighboring fibers, houses capillaries that feed the fiber, and contains satellite cells for repair. The layer around a fascicle is the perimysium, and the layer around the entire muscle is the epimysium. Blood vessels run through these connective tissue layers to supply the fibers but do not encase a single fiber by themselves. So, the layer surrounding a single muscle fiber is the endomysium.

Endomysium wraps each individual muscle fiber. This thin connective tissue layer separates neighboring fibers, houses capillaries that feed the fiber, and contains satellite cells for repair. The layer around a fascicle is the perimysium, and the layer around the entire muscle is the epimysium. Blood vessels run through these connective tissue layers to supply the fibers but do not encase a single fiber by themselves. So, the layer surrounding a single muscle fiber is the endomysium.