Where does the extensor digitorum brevis insert?

• A. Extensor expansion of FDL near the MPJ
• B. Base of the proximal phalanx of the great toe
• C. Calcaneal tuberosity
• D. Lateral aspect of the metatarsal

Answer: (A)

The extensor digitorum brevis is a short dorsum muscle of the foot that originates from the calcaneus and sends slips to the toes. Its insertion is into the extensor expansions of toes 2–4, near the metatarsophalangeal joints. This placement lets the EDB help extend the toes by pulling on the dorsal digital expansions, contributing to MTP extension and aiding IP extension through the hood-like expansions. It does not insert on the base of the proximal phalanx of the big toe, nor on the calcaneal tuberosity (that’s where it originates), nor on the lateral aspect of a metatarsal.