Fibularis longus
fibularis longus | ||
---|---|---|
Antagonist tibialis anterior muscle | | |
Identifiers | ||
Latin | musculus fibularis longus | |
TA98 | A04.7.02.041 | |
TA2 | 2652 | |
FMA | 22539 | |
Anatomical terms of muscle] |
In human anatomy, the fibularis longus (also known as peroneus longus) is a superficial
The fibularis longus is the longest and most superficial of the three
Structure
The fibularis longus arises from the head and upper two-thirds of the lateral, or outward, surface of the fibula, from the deep surface of the fascia, and from the connective tissue between it and the muscles on the front and back of the leg. It occasionally is also connected by a few fibers from the lateral condyle of the tibia. Between the muscle's attachments to the head and body of the fibula, there is a gap through which the common fibular nerve passes to the front of the leg.[2]
The muscle ends in a long tendon, which runs behind the lateral malleolus of the ankle in a groove that it shares with the tendon of the fibularis brevis; the groove is converted into a canal by the superior fibular retinaculum, and the tendons in it are contained in a common mucous sheath.[2]
The tendon then extends forward at an angle across the lateral side of the foot, below the fibular trochlea and the tendon of the fibularis brevis, and under cover of the inferior
The tendon changes direction at two points: first, behind the lateral malleolus; second, on the cuboid bone. In both of these locations, the tendon is thickened. At the cuboid, a fibrocartilaginous sesamoid (sometimes a sesamoid bone) usually develops in the substance of the tendon.[2]
The fibularis longus muscle is supplied by the superficial fibular nerve, which arises from the fifth lumbar and first sacral roots of the spinal cord.[3]
Function
The fibularis longus, together with the fibularis brevis and the
The fibularis longus also tilts the sole of the foot away from the midline of the body (
Together, the fibularis muscles help to steady the leg upon the foot, especially in standing on one leg.[2]
Nomenclature and etymology
Terminologia Anatomica designates "fibularis" as the preferred word over "peroneus.".[4]
The word "peroneus" comes from the Greek word "perone," meaning pin of a brooch or a buckle. In medical terminology, the word refers to being of or relating to the fibula or to the outer portion of the leg.
Additional images
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Bones of the right leg, anterior surface
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Left calcaneus, inferior surface
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Left calcaneus, lateral surface
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Coronal section through right talocrural and talocalcaneal joints
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Fibularis (peroneus) longus labeled at right
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Cross-section through middle of leg
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The popliteal, posterior tibial, and fibular arteries
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Deep nerves of the front of the leg
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Back of left lower extremity
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Lateral aspect of right leg
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Muscles of leg (lateral view, deep dissection)
See also
References
This article incorporates text in the public domain from page 486 of the 20th edition of Gray's Anatomy (1918)
- ^ a b c d "Peroneus longus". Loyola University Chicago. Retrieved 4 August 2019.
- ^ a b c d e f g h i Gray's Anatomy (1918), see infobox
- ISBN 978-0-12-802653-3, retrieved 2021-02-21
- ^ FIPAT (2019). Terminologia Anatomica. Federative International Programme for Anatomical Terminology.