Peroneus brevis

The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is the shorter and smaller of the peroneus muscles.Bones of the right leg. Anterior surface.Bones of the right foot. Dorsal surface.Muscles of the front of the leg.Cross-section through middle of leg.The popliteal, posterior tibial, and fibular arteries.Back of left lower extremity.Fibularis brevis muscleMuscles of the sole of the foot.Dorsum of Foot. Deep dissection.Musclea of Leg. Lateral view. Deep dissection. The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is the shorter and smaller of the peroneus muscles. It arises from the lower two-thirds of the lateral surface of the body of the fibula, medial to the peroneus longus, and from the intermuscular septa separating it from the adjacent muscles on the front and back of the leg. The fibers pass vertically downward, and end in a tendon which runs behind the lateral malleolus along with but in front of that of the preceding muscle, the two tendons being enclosed in the same compartment and lubricated by a common mucous sheath. It then runs forward on the lateral side of the calcaneus, above the calcaneal tubercle and the tendon of the peroneus longus, and is inserted into the tuberosity at the base of the fifth metatarsal bone, on its lateral side. When the base of the fifth metatarsal is fractured, the peroneus brevis may pull on and displace the proximal fragment (Jones Fracture). An inversion sprain of the foot may pull the tendon such that it avulses the tuberosity at the base of the fifth metatarsal.