peroneus longus definition
Peroneus longus Definition. It is the more superficial of the two lateral muscles of the lower leg. The long, strap-like structure is also called fibularis longus. The term Peroneus is derived from a Greek word called âPeroneâ referring to pin of a buckle.Simply put, it relates to the fibula of the leg.eroneus longus Anatomy. The lateral muscle of the leg is interspersed by fibers from the lateral condyle of the tibia. The common fibular nerve passes to the exterior portion of the leg through a gap in order to innervate the muscle.