The flexor digitorum brevis is an intrinsic muscle of the foot. It is located within the first (most superficial) plantar muscle layer of the foot, between the plantar fascia and the tendons of the flexor digitorum longus.
- Attachments: Originates from the medial tubercle of the calcaneus and the plantar aponeurosis. It attaches to the middle phalanges of the lateral four digits.
- Actions: Flexion of the lateral four toes at the proximal interphalangeal joints.
- Innervation: Medial plantar nerve (branch of tibial nerve).
- Blood Supply: Branches of the anterior and posterior tibial arteries.