peroneus tertius
fibularis tertius

During these periods, excessive pressure can be exerted on the peroneus tertius tendon, which runs along the lateral side of the foot.

The fibularis tertius (also known as peroneus tertius) is a muscle of the human body located in the lower limb.

These include the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and peroneus tertius.

It is innervated by the deep fibular nerve, unlike the other peroneal muscles which are innervated by the superficial fibular nerve, since the peroneus tertius is a member of the anterior compartment.

The process can begin with swelling of the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and/or the peroneus tertius muscles in response to strong eccentric contractions sufficient to produce postexercise soreness.

The anterior compartment syndrome of the lower leg (often referred to simply as anterior compartment syndrome), can affect any and all four muscles of that compartment: tibialis anterior, extensor hallucis longus, extensor digitorum longus, and peroneus tertius.

The structures of anterior compartment can be remembered using the mnemonic, "TEA DEPt" for Tibialis anterior, Extensor hallucis longus, Anterior tibial artery, Deep peroneal nerve, Extensor digitorum longus and Peroneus tertius.

There are safety concerns associated with the use of stirrups, including a risk that a fallen rider may get their foot caught in the stirrup and be dragged by the horse, or that long hours of use without rest may cause problems in the human foot's Peroneus Tertius tendon.