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Crus (leg) lateral compartment muscles
The small lateral compartment, like the anterior compartment, arises from the embryonic dorsal limb muscles. The two muscles within this compartment are very similar. They both arise from the lateral aspect of the fibula. They both pursue a pulley-like course behind the lateral malleolus, under the cover of a retinaculum, in their passage to the bottom of the foot. They both plantar flex and evert the foot. The superficial fibular nerve from the posterior divisions of the sacral plexus innervates both muscles. The longer of the two muscles, the peroneus longus muscle, also helps maintain the transverse plantar arch of the foot.
Peroneus longus and the Peroneus brevis