An anterior fibulocalcaneus muscle: An anomalous muscle discovered in the anterior compartment of the leg.

Anomalous fibulocalcaneus muscles were discovered bilaterally in the anterior compartment of the leg during a routine dissection of a 76-year-old Caucasian male in the medical gross anatomy laboratory. These muscles originated from the fibula, anterior crural septum, and the investing fascia of the fibularis tertius, and they passed anterior to the lateral malleolus and inserted on the calcaneus, anterosuperior to the fibular trochlea. To our knowledge, these anterior fibulocalcaneus muscles have not been described previously.