tendinous sheath of extensor pollicis longus muscle
tendinous sheath of ex·ten·sor pol·li·cis lon·gus mus·cle
[TA]the dorsal carpal synovial tendon sheath surrounding the extensor pollicis longus tendon in its passage deep to the extensor retinaculum.
Synonym(s): vagina tendinis musculi extensoris pollicis longi [TA]
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