Fibularis Longus Muscle

Authors
Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscles of the anterior leg1

Muscles of the anterior leg1
Figure 1: Superficial posterior leg muscles1

Deep posterior leg muscles1

Deep posterior leg muscles1

The Mucous sheaths of the tendons around the ankle (lateral view)1

The Mucous sheaths of the tendons around the ankle (lateral view)1
Figure 2: Muscles of the lower leg2
Figure 3: Intrinsic foot muscles2

1st layer of the plantar foot1

1st layer of the plantar foot1

2nd layer of the plantar foot1

2nd layer of the plantar foot1

3rd layer of the plantar foot1

3rd layer of the plantar foot1
Reading list
  • Ch64 Fibularis longus, brevis, tertius muscle3
  • Neuman4
  • MMT5

Origin

Proximal lateral surface of the fibiula6

Insertion

  • Medial cuneiform6
  • Base of 1st MT6

Innervation

Superficial Fibular N. (L5, S1)6

Action

  • TCJ: Plantarflexion6
  • STJ: Eversion6
  • Transverse arch: Support6

The fibularis longus also plays a role in calcaneal frontal plane stabilization. Although it does not insert on the calcaneus, the fibularis longus tendon “hooks” onto the calcaneus allowing it to exert a force upon the calcaneus7. The fibularis longus tendon can control and prevent excessive calcaneal valgus/abduction7.

Tendon

“The tendon of the fibularis (peroneus) longus runs superficially behind the lateral malleolus. Resisted pronation and plantar flexion of the foot make the tendon more prominent”8

References

1.
Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/
2.
Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details
3.
Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.
4.
Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.
5.
Weinstock D. NeuroKinetic Therapy: An Innovative Approach to Manual Muscle Testing. North Atlantic Books; 2010.
6.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.
7.
Jones B. B Project Foundations. b Project; 2025.
8.
Dutton M. Dutton’s Orthopaedic Examination, Evaluation, and Intervention. 5th ed. McGraw Hill Education; 2020.

Citation

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