Peroneus brevis

The peroneus brevis muscle (or fibularis brevis muscle) lies under cover of the peroneus longus, and is the shorter and smaller of the peroneus muscles.

Fibularis brevis muscle
Gray441.png
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Peroneus brevis labeled at bottom left.)
Fibularis brevis muscle - animation.gif
Animation
Details
OriginLower two-thirds of lateral fibula
InsertionFifth metatarsal
ArteryFibular artery (peroneal artery)
NerveSuperficial fibular nerve
ActionsPlantarflexion, eversion
Identifiers
LatinMusculus fibularis brevis
TA98A04.7.02.042
TA22653
FMA22540
Anatomical terms of muscle

StructureEdit

 
The fibularis brevis (bottom-most label) is a muscle of the lower leg, and aids in plantarflexion and eversion of the foot.

It arises from the lower two-thirds of the lateral surface of the body of the fibula, medial to the peroneus longus, and from the intermuscular septa separating it from the adjacent muscles on the front and back of the leg.

The fibers pass vertically downward, and end in a tendon which runs behind the lateral malleolus along with but in front of that of the preceding muscle, the two tendons being enclosed in the same compartment and lubricated by a common mucous sheath.

It then runs forward on the lateral side of the calcaneus, above the calcaneal tubercle and the tendon of the peroneus longus, and is inserted into the tuberosity at the base of the fifth metatarsal bone, on its lateral side. When the base of the fifth metatarsal is fractured, the peroneus brevis may pull on and displace the proximal fragment (Jones Fracture). An inversion sprain of the foot may pull the tendon such that it avulses the tuberosity at the base of the fifth metatarsal.

Nerve supplyEdit

It is innervated by the superficial fibular nerve, also known as the superficial peroneal nerve.[1]

FunctionEdit

The peroneus brevis muscle is the strongest abductor of the foot.[2] It also assists in weak plantarflexion and eversion of the foot.[2] It provides lateral stability to the foot and ankle.[3]

HistoryEdit

EtymologyEdit

The terms "Peroneal" (i.e., Artery, Retinaculum) and "Peroneus" (i.e., Longus and Brevis) are derived from the Greek word Perone (pronounced Pair-uh-knee) meaning pin of a brooch or a buckle. In medical terminology, both terms refer to being of or relating to the fibula or to the outer portion of the leg.

Additional imagesEdit

See alsoEdit

ReferencesEdit

  This article incorporates text in the public domain from page 487 of the 20th edition of Gray's Anatomy (1918)

  1. ^ Apaydin, Nihal (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.), "Chapter 47 - Variations of the Lumbar and Sacral Plexuses and Their Branches", Nerves and Nerve Injuries, San Diego: Academic Press, pp. 627–645, doi:10.1016/b978-0-12-410390-0.00049-4, ISBN 978-0-12-410390-0, retrieved 2021-02-20
  2. ^ a b Sammarco, Vincent James; James Sammarco, G. (2008-01-01), Porter, David A.; Schon, Lew C. (eds.), "Chapter 6 - Injuries to the Tibialis Anterior, Peroneal Tendons, and Long Flexors of the Toes", Baxter's the Foot and Ankle in Sport (Second Edition), Philadelphia: Mosby, pp. 121–146, doi:10.1016/b978-032302358-0.10006-5, ISBN 978-0-323-02358-0, retrieved 2021-02-20
  3. ^ Mansfield, Paul Jackson; Neumann, Donald A. (2019-01-01), Mansfield, Paul Jackson; Neumann, Donald A. (eds.), "Chapter 11 - Structure and Function of the Ankle and Foot", Essentials of Kinesiology for the Physical Therapist Assistant (Third Edition), St. Louis (MO): Mosby, pp. 311–350, doi:10.1016/b978-0-323-54498-6.00011-4, ISBN 978-0-323-54498-6, retrieved 2021-02-21

External linksEdit