Fibularis tertius
The fibularis tertius (also known as the peroneus tertius) is a muscle of the lower limb that is often considered part of the extensor digitorum longus. It is located on the anterior aspect of the leg.
Anatomy[edit]
The fibularis tertius originates from the distal anterior surface of the fibula and the interosseous membrane. It inserts onto the dorsal surface of the base of the fifth metatarsal bone.
Innervation[edit]
The muscle is innervated by the deep fibular nerve, which is a branch of the common fibular nerve.
Blood Supply[edit]
The fibularis tertius receives its blood supply from the anterior tibial artery.
Function[edit]
The primary actions of the fibularis tertius are dorsiflexion and eversion of the foot. This muscle helps in stabilizing the foot during walking and running.
Clinical Significance[edit]
The fibularis tertius can be involved in various foot and ankle pathologies. Injury or strain to this muscle can result in pain and difficulty in foot movements.
