tendinous sheath of flexor digitorum longus muscle (of foot)
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) longiTA
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Examples: glitazone, GI cocktail, etc.