peroneal longus

peroneal long·us

A muscle with origin from the fibula and the tibia, with insertion to the medial cuneiform bone and the base of the first metatarsal, with nerve supply from the peroneal nerve, and whose action causes plantar flexion and eversion of the foot. Also called fibularis longus.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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The differential diagnosis should include lumbar radiculopathy, post-traumatic intraneural hemorrhage, and nerve compression near the tendinous arch located at the fibular insertion of the peroneal longus due to muscle and nerve tumors, including schwannoma, neurofibroma, sarcoma, and myxoma.
Peroneal longus tendonitis causes pain of the lateral ankle where the tendon passes beneath the cuboid towards the insertion on the plantar base of the first metatarsal.