Which connective tissue surrounds each individual muscle fiber?

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

Answer: (B)

Endomysium surrounds each individual muscle fiber. It forms a thin, delicate layer between neighboring fibers, wrapping each one and containing capillaries and often satellite cells to supply nutrients and support repair. Its composition, mainly reticular fibers with a little collagen, allows efficient diffusion of oxygen and nutrients to the fiber and helps transmit force to the surrounding connective tissue. Larger-scale organization happens with the perimysium, which groups fibers into fascicles, and the epimysium, which encloses the whole muscle. Fascia sits outside, wrapping larger muscle compartments. So, the tissue directly around a single muscle fiber is the endomysium.