Tibialis posterior muscle

Last revised by Assoc Prof Craig Hacking on 17 Dec 2020

The tibialis posterior muscle is one of the small muscles of the deep posterior compartment of the leg.

Summary

  • origin: upper half of posterior shaft of tibia and upper half of fibula between medial crest and interosseous border, and adjacent interosseous membrane.
  • insertion: navicular and medial cuneiform
    • the tendon splits into two slips after passing inferior to plantar calcaneonavicular ligament
      • superficial slip inserts on the tuberosity of the navicular bone and sometimes medial cuneiform
        • this is the main slip, accounting anterior two-thirds of the tendon
      • deeper slip divides again into slips and has variable insertions onto the plantar surfaces of metatarsals 2 - 4, second cuneiform, cuboid, sustentaculum tali 
  • action: plantarflexion and inversion of the foot
  • arterial supply: posterior tibial artery
  • innervation: tibial nerve
  • antagonist: tibialis anterior
  • variants:
    • insertion into accessory navicular

Related pathology

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Cases and figures

  • Figure 1
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  • Figure 2: Gray's anatomy illustration
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  • Figure 3: plantar tendons and ligaments (Gray's illustration)
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