flexor accessorius

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flexor accessorius

; quadratus plantae third-layer intrinsic foot muscle
  • origin from medial and lateral margins of plantar aspect of calcaneum

  • insertion into medial aspect of flexor digitorum longus tendon

  • nerve supply lateral plantar nerve

  • action aligns direction of pull of flexor digitorum longus along sagittal plane of the foot; indirect flexion of lesser toes (via its insertion into flexor digitorum longus)