6. Peroneus Tertius

Origin: Inferior 1/3 of the anterior fibula and interosseous membrane

Insertion: Dorsum of base of 5th metatarsal

Action:

  • Dorsiflexes ankle
  • Assists in ankle eversion

Innervation: Deep peroneal nerve (L5/S1)

Peroneus tertius.
Figure 3.15 Peroneus tertius, adapted by Uwe Gille from the original image by Henry Gray and Henry Vandyke Carter (Public domain).

Needling

Position: Prone

Palpation: Palpate this muscle on the inferior lateral aspect of the anterior shin

Technique: Needle perpendicular to the muscle using the fibula as a bony backdrop

Caution: Low

Needling peroneus tertius at the lower 1/4 for the fibula.
Figure 3.16 Needling peroneus tertius at the lower 1/4 for the fibula, original image by Nadine Crocker, CC BY-NC 4.0.

Video 3.6 Needling of peroneus tertius, original video by Nadine Crocker, CC BY-NC 4.0.

License

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Sinew Channel Needling Copyright © 2026 by Nadine Crocker is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.

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