Individual Variation.—In several legs, the muscle also arises from the distal part of the posterior surface of the outer cnemial crest.
M. Peroneus Brevis, [Figs. 14], [16], [17], [18]8, [19]A
T. pallidicinctus
General Description and Relations.—Small; on lateral surface of distal part of tibiotarsus; mainly anterior to fibula; bounded posteriorly and laterally by M. flexor digitorum longus (fused with latter), anteriorly by M. tibialis anticus, and anteromedially by M. extensor digitorum longus (usually slightly fused to latter).
Origin.—The muscle arises by fleshy and tendinous fibers from the medial and anterior surfaces of the fibula beginning a short distance below the distal end of the fibular crest and from the anterolateral surface of the tibiotarsus anterior to the fibula; the anteromedial edge attaches to the anterolateral intermuscular line.
Insertion.—The short, slender, ossified tendon passes along the anterolateral surface of the tibiotarsus and through a retinaculum immediately proximal and anteromedial to the retinaculum for the anterior branch of the tendon of M. peroneus longus; the tendon becomes flexible and widens as it passes across the lateral surface of the intratarsal joint deep to the tendon of M. peroneus longus, turning posteriorly and attaching to the proximolateral corner of the hypotarsus.
Innervation.—The superficial peroneal branch of the peroneal nerve gives one or two twigs to the anterior surface of the proximal part.
Individual Variation.—None of significance.
T. cupido