PERONEUS LONGUS MUSCLE
The fibularis longus (also known as peroneus longus) is a superficial muscle in the human leg, and acts to evert and plantar flex the ankle.
It is attached proximally to the head of the fibula and its 'belly' runs down most of this bone.
Fibularis longus becomes a tendon that goes posteriorly around the lateral malleolus of the ankle, then continues under the foot to attach to the 1st metatarsal.
It is a muscle of the lateral compartment of the leg and is innervated by the superficial fibular nerve.
Details from Gray's anatomy
The Peronæus longus (fibularis longus) is situated at the upper part of the lateral side of the leg, and is the most superficial of the three fibularis muscles.
It arises from the head and upper two-thirds of the lateral surface of the body of the fibula, from the deep surface of the fascia, and from the intermuscular septa between it and the muscles on the front and back of the leg; occasionally also by a few fibers from the lateral condyle of the tibia. Between its attachments to the head and to the body of the fibula there is a gap through which the common peroneal nerve passes to the front of the leg.
It ends in a long tendon, which runs behind the lateral malleolus, in a groove common to it and the tendon of the Peronæus brevis; the groove is converted into a canal by the superior peroneal retinaculum, and the tendons in it are contained in a common mucous sheath.
The tendon then extends obliquely forward across the lateral side of the calcaneus, below the trochlear process, and the tendon of the Fibularis (Peronæus) brevis, and under cover of the inferior peroneal retinaculum.
It crosses the lateral side of the cuboid, and then runs on the under surface of that bone in a groove which is converted into a canal by the long plantar ligament; the tendon then crosses the sole of the foot obliquely, and is inserted into the lateral side of the base of the first metatarsal bone and the lateral side of the first cuneiform.
Occasionally it sends a slip to the base of the second metatarsal bone.
The tendon changes its direction at two points: first, behind the lateral malleolus; secondly, on the cuboid bone; in both of these situations the tendon is thickened, and, in the latter, a sesamoid fibrocartilage (sometimes a bone), is usually developed in its substance.
See also
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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