Where does the Extensor Digitorum Brevis typically insert?

Where does the Extensor Digitorum Brevis typically insert?

• A. Base of the distal phalanx
• B. Base of the proximal phalanx
• C. Across the extensor hood of the toes
• D. Along the dorsal aspect of the metatarsophalangeal joints

Answer: (B)

Extensor digitorum brevis is a small dorsum-of-the-foot muscle whose slips reach the bases of the proximal phalanges of the toes. By anchoring there, it helps extend the toes at the metatarsophalangeal joints, with some fibers also contributing to the dorsal digital expansions. This insertion location—on the bases of the proximal phalanges—fits its role in toe extension, rather than attaching to the distal phalanges, crossing the extensor hood, or lying along the dorsal aspect of the MTP joints.