tendinous sheath of flexor digitorum longus muscle (of foot)

tendinous sheath of flex·or di·gi·to·rum lon·gus mus·cle (of foot)

[TA] the tibial tarsal synovial tendon sheath that envelops the flexor digitorum longus tendons as they pass into the foot deep to the flexor retinaculum. Synonym(s): vagina tendinum musculi flexoris digitorum (pedis) longi [TA]