Fibularis tertius

Peroneus tertius muscle - animation

Peroneus tertius

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Muscle of the human body

Fibularis tertius

The fibularis tertius muscle is shown in the lower right.
Latin	Musculus fibularis tertius
Nerve	Deep fibular nerve

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

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

The muscle is innervated by the deep fibular nerve, which is a branch of the common fibular nerve.

Blood Supply

The fibularis tertius receives its blood supply from the anterior tibial artery.

Function

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

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.

See Also

• Fibularis longus
• Fibularis brevis
• Extensor digitorum longus
• Lower limb anatomy