Question: what are extensor hallucis brevis?
Answer: Extensor hallucis brevis muscle (Musculus extensor hallucis brevis) Extensor hallucis brevis is a short muscle located in the dorsum of the foot, attaching between the calcaneus and proximal phalanx of the big toe (hallux). ... Sometimes, the fibers of these two muscles fuse, making a single muscle that extends the toes.