which connective tissue layer surrounds the entire muscle
The epimysium is the connective tissue surrounding the entire muscle organ. The endomysium is the connective tissue surrounding individual muscle fibers, and they're packed within a fascicle. Myofibrils are organelles within the muscle cell that contain thick and thin myofilaments. The myofilaments are organized into sarcomeres, and they serve as the functional units of skeletal muscle.