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Medical Definition of Tendon sheath of abductor pollicis longus and extensor pollicis brevis muscles
1. The synovial sheath lining the compartment of the extensor retinaculum that contains the abductor pollicis longus and extensor pollicis brevis tendons. Synonym: vagina tendinum musculorum abductoris longi et extensoris brevis pollicis. (05 Mar 2000)