Fibularis is a medical term that refers to the muscles in the lower leg. These muscles are an important part of the anatomy of the lower leg, helping to move the foot and allowing us to walk, run, and jump. There are several synonyms for fibularis, including the peroneal muscles, which is the term used more commonly in anatomical reference materials. Other synonyms for fibularis include the lateral compartment muscles and the external compartment muscles of the lower leg. These muscles are found on the outer side of the leg, between the knee and ankle, and play a vital role in the stability and movement of the foot and ankle.