EN | DE | PT Contact How to study Login Register

Fibular/Peroneal muscles of the leg - want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

Sign up for your free Kenhub account today and join over 1,130,639 successful anatomy students.

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Fibular/Peroneal muscles of the leg

The fibular/peroneal muscles are a group of two muscles of the leg that lie within the fibular compartment of the leg. Originating from the fibula and inserting on certain metatarsal bones, those muscles play an important role in the movement of the foot at the ankle joint.

When lowering the foot they can be easily seen forming the surface of the lateral leg. This article will describe the attachments of the two fibular muscles, namely the fibular longus and brevis, together with their innervartion and some relevant clinical aspects.

Key facts about the peroneal muscles
Fibularis longus

Origins:Head of fibula, Superior 2/3 of lateral surface of fibula, Intermuscular septa

Insertions: Medial cuneiform bone, Metatarsal bone 1

Innervation: Superficial fibular nerve (L5, S1)

Function: Talocrural joint: Foot plantar flexion; Subtalar joint: Foot eversion; Supports longitudinal and transverse arches of foot

Fibularis brevis

Origins: Distal 2/3 of lateral surface of fibula

Insertions: Tuberosity of metatarsal bone 5

Innervation: Superficial fibular nerve (L5, S1)

Function: Talocrural joint: Foot plantar flexion; Subtalar joint: Foot eversion

Anatomy

Origins & Insertions

In detail, they are:

  • Fibularis longus muscle/ Peroneus longus muscle (left): originates at the head and superior two third of the lateral shaft of the fibula and the intermuscular septa. It inserts at the plantar side of the medial cuneiform and first metatarsal bone.

Want to learn more about the muscles of the lower limb? Comprised of handy tables and diagrams listing attachments, innervations and functions for every muscle, our lower limb muscle anatomy chart will cut your study time in half. 

  • Fibularis brevis muscle/ Peroneus brevis muscle: has its origin at the distal two-thirds of the lateral surface of the fibula and is covered by the fibularis longus muscle in the most part. Its tendon inserts at the tuberosity of the fifth metatarsal bone.
    Recommended video: Functions of the fibularis longus muscle
    Functions and anatomy of the fibularis longus muscle shown with 3D model animation.

The tendons of both muscles run caudally towards the foot behind the lateral malleolus and then ventrally along the lateral foot edge. There they are led by two canal-like peroneal retinacula. The superior fibular retinaculum stretches between the lateral malleolus and calcaneus. The inferior fibular retinaculum stretches between the inferior extensor retinaculum of the anterior muscles of the leg and calcaneus.

Recommended video: Functions of the fibularis brevis muscle
Functions and anatomy of the fibularis brevis muscle shown with 3D model animation.

Innervation

Both peroneal muscles are supplied by the superficial fibular nerve (L5-S1).

Function

The fibularis longus and brevis muscles move both the upper and lower ankle joints. In the upper ankle joint they force a depression of the foot (plantar flexion) as their tendons run behind the flexion-extension axis. In the lower ankle joint their contraction leads to an eversion (pronation) which means that the medial foot edge is lowered whereas the lateral foot edge rises. Additionally the tendon of the fibularis longus muscle supports the lateral longitudinal and transverse arches of the foot.

Clinical Aspects

When the superficial fibular nerve is paralysed the pronation of the foot is severely restricted. Thus the supination predominates so that during the lifting of the foot it simultaneously drifts medially (equinovarus position). When the affected patients try to walk it strikes how they place the lateral foot edge first in each step of the affected leg. Furthermore one may observe a shrinking of the lateral calf due to an atrophy of the peroneal muscles. Common causes for a lesion of the superficial fibular nerve include:

  • injuries to the fibular head
  • a too tight cast or inappropriate splint positioning of the leg
  • polio (infantile paralysis)

Fibular/Peroneal muscles of the leg - want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

Sign up for your free Kenhub account today and join over 1,130,639 successful anatomy students.

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Show references

References:

  • M. Schünke/E. Schulte/U. Schumacher: Prometheus – LernAtlas der Anatomie – Allgemeine Anatomie und Bewegungssystem, 2.Auflage, Thieme Verlag (2007), S.480-481
  • W. Graumann/D.Sasse: CompactLehrbuch der gesamten Anatomie – Band 2 – Bewegungsapparat, Schattauer Verlag (2003), S.208-210
  • J. W. Rohen: Topographische Anatomie, 10.Auflage, Schattauer Verlag (2008), S.162
  • A. Lange: Physikalische Medizin, Springer Verlag (2003), S.50-51

Author:

  • Achudhan Karunaharamoorthy

Illustrators:

  • Fibularis brevis muscle - axial view - National Library of Medicine
© Unless stated otherwise, all content, including illustrations are exclusive property of Kenhub GmbH, and are protected by German and international copyright laws. All rights reserved.

Related diagrams and images

Continue your learning

Read more articles

Show 8 more articles

Watch videos

Show 13 more videos

Take a quiz

Browse atlas

Well done!

Register now and grab your free ultimate anatomy study guide!