extensor digital expansion

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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.
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The adductors of the thumb insert onto the extensor expansion through its aponeurosis, which lies superficial to the ulnar collateral ligament.
The superficial insertion of the adductor mechanism is the extensor expansion via the adductor aponeurosis; the deep insertion extends to the palmar aspect of the proximal phalanx via the ulnar sesamoid of the metacarpophalangeal joint.

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