extensor digital expansion

ex·ten·sor dig·i·tal ex·pan·sion

a triangular tendinous aponeurosis including the tendon of the extensor digitorum centrally, interosseus tendons on each side, and a lumbrical tendon laterally. It covers the dorsal aspect of the metacarpophalangeal joint and the proximal phalanx.

Synonym(s): dorsal hood, extensor aponeurosis, extensor expansion

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