Flexor Digiti Minimi Brevis, Plantar View

Description

Along the lateral plantar compartment of the male foot, the flexor digiti minimi brevis lies superficial to the fifth metatarsal, its fusiform belly tracking distally toward the base of the proximal phalanx of the fifth toe. The tendon continues anteriorly to insert on the plantar aspect of the proximal phalanx, positioned lateral to the flexor digitorum brevis tendons and closely related to the fibular (peroneus) longus tendon as it courses obliquely across the sole. Metatarsals I to V and the phalanges frame the muscle’s line of pull, with the metatarsophalangeal and interphalangeal joint surfaces indicated by articular cartilage. Flexor digiti minimi brevis is a small structure, but it matters when you are teaching or operating around the fifth ray. Its action, flexion at the fifth metatarsophalangeal joint, becomes clinically relevant in lateral forefoot pain syndromes and deformity patterns such as tailor’s bunion and clawing of the fifth toe, where intrinsic muscle imbalance and altered plantar pressures can exacerbate symptoms. The muscle also provides a practical landmark when distinguishing the lateral plantar intrinsic layer from adjacent structures, including the abductor digiti minimi and the neurovascular bundles from the lateral plantar nerve and artery. Small, but specific. Use this illustration in gross anatomy and podiatric biomechanics teaching to orient students to the lateral plantar musculature and the fifth ray, or in surgical and sports medicine publications discussing lateral forefoot approaches, metatarsophalangeal pathology, and intrinsic muscle contributions to deformity. Anatomical accuracy verified by SciePro's Medical Advisory Board.