Flexor Digitorum Brevis Anatomy

The Flexor Digitorum Brevis Origin, Insertion, Action

Origin:  Medial process of the calcaneal tuberosity, the central part of the plantar aponeurosis, and the intramuscular septa between it and the adjacent muscles
Insertion:  By four tendons, each attaching to the medial and lateral borders and plantar surface of the middle phalanx of each of the four lateral toes
Actions:  Flexion of the four lateral toes
Innervation:  Medial plantar nerve (S1, S2)
Blood Supply: Medial plantar artery from the posterior tibial artery

Primary Actions of the Flexor Digitorum Brevis

1. Flexion of the four lateral toes at the proximal interphalangeal joints
  Agonists:
  • Flexor Digitorum Longus
  Antagonists:
  • Extensor Digitorum Longus
  • Extensor Digitorum Brevis
2. Flexion of the four lateral toes at the metatarsophalangeal joints
Agonists:
  • Flexor Digitorum Longus
  • Flexor Digiti Minimi (fifth digit)
  Antagonists:
  • Extensor Digitorum Longus
  • Extensor Digitorum Brevis

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