Flexor Hallucis Longus Anatomy

Flexor Hallucis Longus Muscle

Origin: Distal two-thirds of the posterior surfaces of the fibula, the adjacent interosseus membrane, the posterior intermuscular septum, and the lateral part of the fascia covering tibialis posterior
Insertion: Plantar aspect of the base of the distal phalanx of the great toe after traveling between the two sesamoids associated with the first metatarsal head
Actions: Flexion of the great toe
Innervation: Tibial nerve (L5, S1, S2 )
Blood Supply: Branches from the posterior tibial artery

Primary Actions of the Flexor Hallucis Longus

1.  Flexion of the great toe at the interphalangeal joint

Agonists:

  • None

Antagonists:

  • Extensor Hallucis Longus

2.  Flexion of the great toe at the metatarsophalangeal joint

Agonists:

  • Flexor Hallucis Brevis

Antagonists:

  • Extensor Hallucis Longus
  • Extensor Hallucis Brevis

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Secondary Actions of the Flexor Hallucis Longus

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

  • Gastrocnemius
  • Soleus

Antagonists:

  • Tibialis Anterior