tendinous sheath of flexor pollicis longus muscle

tendinous sheath of flex·or pol·li·cis lon·gus mus·cle

the palmar carpal synovial tendon sheath that envelops the tendon of the flexor pollicis longus in its course through the carpal canal; it is continuous with the digital sheath of the thumb, the two generally being considered as one sheath.
Farlex Partner Medical Dictionary © Farlex 2012
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