In muscle anatomy, what term describes the middle part of the muscle?

The term that describes the middle part of the muscle is known as the belly. The belly of a muscle is its thickened, central portion, which contracts to produce movement. This central area is surrounded by tendons that attach the muscle to bones. Understanding this terminology is essential for grasping how muscles function, as the belly is the active part that facilitates movement through contraction and relaxation. It is distinct from the origin, which refers to the fixed attachment point of the muscle, and the insertion, which is the point that moves when the muscle contracts. The use of "flesh" is more general and does not specifically denote the anatomical structure related to the muscle's function.