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The occasional head of flexor pollicts longus muscle arising by a flimsy tendon from the flexor digitorum superficialis and inserting by a thin tendon into the principal belly of flexor pollicis longus.

The occasional head of flexor pollicts longus muscle arising by a flimsy tendon from the flexor digitorum superficialis and inserting by a thin tendon into the principal belly of flexor pollicis longus.