Distal lower limb muscle weakness Peroneal muscle weakness 2012-04-11T10:26:15Z THe peroneal muscles (also known as fibularis muscles) originate from the fibula. The peroneal longus and brevis muscles are located on the lateral side of the leg, while peroneal tertius is on the anterior side. UMLS:C0240733 Fibularis muscle weakness Weakness of the peroneal muscles. HP:0011727