Extensor Digitorum Brevis Anatomy

The Extensor Digitorum Brevis Origin, Insertion, Action

Origin:   Anterior, superolateral surface of the calcaneus, in front of the lateral groove for peroneus brevis, from the interosseous talocalcaneal ligament, and from the stem of the inferior extensor retinaculum.
Insertion:  Lateral sides of the tendons of extensor digitorum longus for the second, third, and fourth toes.
Actions:  Extension of the four lateral toes
Innervation:  Deep peroneal nerve (L5, S1)
Blood Supply: Branches from the anterior tibial artery

Primary Actions of the Extensor Digitorum Brevis

1. Extension of the second, third, and fourth toes at the proximal interphalangeal joints.
  Agonists:
  •  Extensor Digitorum Longus
  Antagonists:
  • Flexor Digitorum Longus
  • Flexor Digitorum Brevis
2. Extension of the second, third, and fourth toes at the distal  interphalangeal  joints
Agonists:
  •  Extensor Digitorum Longus
  Antagonists:
  • Flexor Digitorum Longus
  • Flexor Digitorum Brevis
3. Assists with extension of the second, third and fourth toes at the metatarsophalangeal joints.

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