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Flexor Digiti Minimi Brevis Tendon of the Foot

tendo musculi flexoris digiti minimi brevis pedis

The flexor digiti minimi brevis of the foot arises from the plantar surface of the base of the fifth metatarsal and the fibrous sheath of the peroneus longus tendon. It inserts on the lateral surface of the base of the proximal phalanx of the fifth toe, often alongside the abductor digiti minimi. Together these muscles form the hypothenar eminence of the foot, the lateral muscular bulge of the mid-forefoot.

Region: Foot & Ankle

Clinical Relevance

Clinical Notes

The flexor digiti minimi brevis tendon and its fifth metatarsal origin are relevant in the assessment of fifth metatarsal base fractures and in the diagnosis of lateral plantar nerve entrapment. The deep branch of the lateral plantar nerve, which supplies this muscle, passes between the flexor digiti minimi brevis and the abductor digiti minimi, and can be compressed at this level producing lateral plantar pain and fifth toe weakness.

Pathology

Common Injuries & Conditions

Lateral Plantar Nerve Deep Branch Entrapment

Compression of the nerve to flexor digiti minimi brevis by fibrous bands between the hypothenar muscles produces lateral plantar pain and weakness of fifth toe flexion, a rare cause of lateral foot pain distinct from plantar fasciitis and Morton neuroma.