|Peroneus brevis muscle|
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Peroneus brevis labeled at bottom left.)
|Latin||Musculus fibularis brevis,
musculus peronaeus brevis
|Origin||Lower two-thirds of lateral fibula|
|Fibular artery (peroneal artery)|
|Superficial fibular nerve|
|Anatomical terms of muscle|
The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is a shorter and smaller muscle.
It arises from the lower two-thirds of the lateral surface of the body of the fibula; medial to the fibularis 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 trochlear process and the tendon of the Peronæus longus, and is inserted into the tuberosity at the base of the fifth metatarsal bone, on its lateral side. A small clinical important point is that when the base of the fifth metatarsal is fractured, the peroneus brevis may pull on and displace the proximal fragment. (See Jones Fracture)
It is also innervated by the superficial fibular (peroneal) nerve.
The terms "Peroneal" (i.e., Artery, Retinaculum) and "Peroneus" (i.e., Longus and Brevis) are derived from the Greek word Perone (pronounced Pair-uh-knee) meaning pin of a brooch or a buckle. In medical terminology, both terms refer to being of or relating to the fibula or to the outer portion of the leg.
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