peroneus tertius

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peroneus tertius

The muscle arising from the anterior portion of the distal one third of the tibia and the adjacent portion of the interosseous membrane and attaching on the dorsal surface of the fifth metatarsal. The peroneus tertius is a secondary contributor to ankle dorsiflexion and eversion. This muscle is absent in a significant proportion of the population.
See also: peroneus

peroneus tertius

small extrinsic foot (forms lateral part of extensor digitorum brevis), within anterior compartment of lower leg
  • origin continuous with lower part of origin of extensor digitorum longus, i.e. distal one-quarter of medial surface of fibula and adjacent interosseous membrane

  • insertion dorsal area of proximal half of fifth metatarsal

  • nerve supply deep peroneal nerve

  • action foot eversion at subtalar joint; ankle joint dorsiflexion; eversion of the foot and dorsiflexion of the ankle

References in periodicals archive ?
both gastrocnemii and peroneus longus coactivated, tibialis anterior and peroneus tertius coactivated, and semimembranosus and all three vasti coactivated).
Coactivation of the peroneus tertius improved the range of feasible postures.
The single best electrode combination suggested by this study consists bilaterally of the gastrocnemii coactivated with the peroneus longus (using a branched intramuscular electrode), the tibialis anterior coactivated with the peroneus tertius (via stimulation of the deep peroneal nerve), all of the vasti coactivated with the rectus femoris (via stimulation of the femoral nerve), and intramuscular electrodes in the semimembranosus, gluteus maximus, gluteus medius (with emphasis on the anterior portion), adductor magnus (with emphasis on the superior portion), and erector spinae.
Peroneus tertius is highly variable in its form and muscle bulk but is rarely completely absent.
Peroneus Tertius may play a special proprioceptive role in sensing sudden inversion and then contracting reflexively to protect the anterior tibio-fibular ligament, the most commonly sprained ligament of the body.
The clinical importance of the Peroneus Tertius concerning prevention and treatment of ankle ligament injuries is low.