Final answer:
From the outside of a muscle fiber inward, the correct order is epimysium, perimysium, fascicle, sarcolemma, endomysium, and myofilaments, which are the structure of a skeletal muscle from most external to most internal.
Step-by-step explanation:
When arranging structures from the outside of a muscle fiber moving inwards, the correct order is as follows: epimysium, perimysium, fascicle, sarcolemma, endomysium, and finally, myofilaments. This order reflects the layers of connective tissues and components starting from the most external (the whole muscle level) to the most internal (the cellular and molecular level within the muscle fiber itself).
The epimysium is the most external layer that surrounds the entire muscle. The perimysium is a layer that bundles muscle fibers into fascicles. Within each fascicle, the individual muscle fibers are surrounded by the sarcolemma. The endomysium is a thin connective tissue that wraps each muscle fiber. Finally, within the muscle fibers are the myofilaments, which consist of actin and myosin proteins responsible for muscle contraction.