Fibularis tertius

From WikiMD's Wellness Encyclopedia

Peroneus tertius muscle - animation
Peroneus tertius
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Fibularis tertius
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The fibularis tertius muscle is shown in the lower right.
Details
OriginDistal anterior surface of the fibula also the interosseous membrane
InsertionDorsal surface of the base of the fifth metatarsal bone
ArteryAnterior tibial artery
NerveDeep fibular nerve
ActionsDorsiflexion and eversion of the foot
AntagonistTibialis posterior
Identifiers
LatinMusculus fibularis tertius
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Anatomical terms of muscle
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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 | edit source]

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 | edit source]

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

Blood Supply[edit | edit source]

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

Function[edit | edit source]

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 | edit source]

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[edit | edit source]

References[edit | edit source]

Contributors: Prab R. Tumpati, MD