Each bundle of skeletal muscle fibers, covered by a perimysium, is called a:

A bundle of skeletal muscle fibers is referred to as a fascicle. This structure is enveloped by a layer of connective tissue known as the perimysium, which helps organize the fibers within the muscle and provides support. The arrangement of fascicles in a muscle contributes to the muscle’s overall strength and functionality, as well as determining the muscle's shape and the direction of force during contraction.

Myofibrils are the smaller subunits within a muscle fiber that contain the actual contractile elements, but they do not encompass the broader organization of fibers. Fibromyalgia is a condition characterized by widespread pain, and muscle belly is a term used to describe the central part of a muscle. These terms do not describe the specific organization of muscle fibers as fascicles do. Understanding these definitions helps clarify the hierarchical organization of muscle structure, starting from individual muscle fibers to the fascicle level and beyond.