extensor digitorum brevis


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extensor digitorum brevis

a muscle that flexes the three middle toes and the proximal metatarsophalangeal joint of the great toe.

extensor digitorum brevis

; EDB intrinsic foot muscle
  • origin from anterior dorsal surface of calcaneum and local inferior extensor retinaculum; it divides into four parts

  • insertion lateral three segments insert into long extensor tendons of second, third and fourth toes, and thence into their intermediate and terminal phalanges via their dorsal expansions; most medial segment forms extensor hallucis brevis (see extensor hallucis brevis)

  • nerve supply deep peroneal nerve

  • action extension of second, third and fourth metatarsophalangeal joints and extension of interphalangeal joints of second, third and fourth toes

References in periodicals archive ?
The deep peroneal nerve runs anteriorly, supplying motor branches to the tibialis anterior, extensor hallucis longus and extensor digitorum brevis, ankle and toe dorsiflexors, and finally the peroneus tertius, a minor ankle evertor.
10-12) In hallux rigidus, interposition with the capsule and a portion of flexor hallucis brevis and extensor digitorum brevis tendons has been described.

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