Final answer:
The three connective tissue layers from deep to superficial in a muscle are the endomysium, perimysium, and epimysium. They enclose muscle fibers and fascicles, providing structure and aiding in efficient muscle function.
Step-by-step explanation:
In the structure of a muscle, there are three concentric layers of connective tissue that provide support and compartmentalization. These layers, from deep to superficial, are the endomysium, the perimysium, and the epimysium. The endomysium is a thin layer that encircles each individual muscle fiber, supplying it with nutrients and extracellular fluid. It is followed by the perimysium, which groups the muscle fibers into bundles known as fascicles. Finally, the outermost layer is the epimysium, which wraps around the entire muscle, separating it from other tissues and organs and enabling powerful contractions while maintaining structural integrity. Together, these layers contribute to the muscle's ability to function and move efficiently.