
Flexor Digitorum Longus Muscle
Primary Actions of the Flexor Digitorum Longus
1. Flexion of the four lateral toes at the metatarsophalangeal joints
Agonists:
- Flexor Digitorum Brevis
- Flexor Digiti Minimi (fifth digit)
Antagonists:
- Extensor Digitorum Longus
- Extensor Digitorum Brevis
Lumbricals, dorsal interossei (second, third, and fourth digits), and plantar interossei (third, fourth, and fifth digits) assist with flexion of the toes at the metatarsophalangeal joints.
2. Flexion of the four lateral toes at the proximal interphalangeal joints
Agonists:
- Flexor Digitorum Brevis
Antagonists:
- Extensor Digitorum Longus
- Extensor Digitorum Brevis
3. Flexion of the four lateral toes at the distal interphalangeal joints
Agonists:
- None
Antagonists:
- Extensor Digitorum Longus
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Secondary Actions of the Flexor Digitorum Longus
1. Assists with plantarflexion of the foot at the ankle
Agonists:
- Gastrocnemius
- Soleus
Antagonists:
- Tibialis Anterior
Plantaris, tibialis posterior, peroneus longus, and flexor hallucis longus also assist with plantarflexion of the foot at the ankle.
Information about cause and effect of Flexor Digitorum Longus pain: Flexor Digitorum Longus: Foot and Toe Pain