Extensor Hallucis Longus Anatomy

Extensor Hallucis Longus Muscle

Origin: Middle half of the medial surface of the fibula
Insertion: Dorsal aspect of the base of the distal phalanx of the great toe
Actions: Extension of the great toe
Innervation: Deep peroneal nerve (L5, S1)
Blood Supply: Branches from the anterior tibial artery

Primary Actions of the Extensor Hallucis Longus

1.  Extension of the great toe at the interphalangeal joint

Agonists:

  • Extensor hallucis brevis

Antagonists:

  • Flexor hallucis longus

2.  Extension of the great toe at the metatarsophalangeal joint

Agonists:

  • Extensor hallucis brevis

Antagonists:

  • Flexor hallucis longus
  • Flexor hallucis brevis

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Secondary Actions of the Extensor Hallucis Longus

1. Assists with dorsiflexion of the foot at the ankle
Agonists:

  • Tibialis anterior

Antagonists:

  • Gastrocnemius
  • Soleus

Peroneus tertius and extensor digitorum longus also assist with dorsiflexion of the foot at the ankle.

2. Tightens the subtalar joints