The fibularis muscles (also called peroneus muscles or peroneals) are a group of muscles in the lower
leg
A leg is a weight-bearing and locomotive anatomical structure, usually having a columnar shape. During locomotion, legs function as "extensible struts". The combination of movements at all joints can be modeled as a single, linear element cap ...
.
Description
The muscle group is normally composed of three muscles:
fibularis longus
In human anatomy, the fibularis longus (also known as peroneus longus) is a superficial muscle in the lateral compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body ( eversion) and to extend the foot downwa ...
,
fibularis brevis
In human anatomy, the fibularis brevis (or peroneus brevis) is a muscle that lies underneath the fibularis longus within the lateral compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body (eversion) and to ...
, and
fibularis tertius
In human anatomy, the fibularis tertius (also known as the peroneus tertius) is a muscle in the anterior compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body ( eversion) and to pull the foot upward towar ...
.
The fibularis longus and fibularis brevis are located in the
lateral compartment of the leg and are supplied by the
fibular artery
In anatomy, the fibular artery, also known as the peroneal artery, supplies blood to the lateral compartment of the leg. It arises from the tibial-fibular trunk.
Structure
The fibular artery arises from the bifurcation of tibial-fibular trunk ...
and the
superficial fibular nerve
The superficial fibular nerve (also known as superficial peroneal nerve) is a mixed (motor and sensory) nerve that provides motor innervation to the fibularis longus and fibularis brevis muscles, and sensory innervation to skin over the antero- ...
. The fibularis tertius is located in the
anterior compartment of the leg and is supplied by the
anterior tibial artery
The anterior tibial artery is an artery of the leg. It carries blood to the anterior compartment of the leg and dorsal surface of the foot, from the popliteal artery.
Structure
Course
The anterior tibial artery is a branch of the popliteal ...
and the
deep fibular nerve
The deep fibular nerve (also known as deep peroneal nerve) begins at the bifurcation of the common fibular nerve between the fibula and upper part of the fibularis longus, passes infero-medially, deep to the extensor digitorum longus, to the a ...
. While all three muscles move the sole of the foot outward, away from the midline of the body (
eversion), the longus and brevis extend the foot downward away from the body (
plantar flexion
Motion, the process of movement, is described using specific anatomical terms. Motion includes movement of organs, joints, limbs, and specific sections of the body. The terminology used describes this motion according to its direction relativ ...
), whereas the tertius muscle pulls the foot upward toward the body (
dorsiflexion
Motion, the process of movement, is described using specific anatomical terms. Motion includes movement of organs, joints, limbs, and specific sections of the body. The terminology used describes this motion according to its direction relativ ...
).
The fibularis muscles are highly variable. Several variants are occasionally present, including the peroneus digiti minimi and the peroneus quartus. The quartus is more closely associated with the tendons of the
extensor digitorum longus
The extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg.
Structure
It arises from the lateral condyle of the tibia; from the upper three-quarters of the anterior surface of the body of the fibula; ...
and may send a small tendon to the fifth (or little) toe.
Nomenclature
''
Terminologia Anatomica
''Terminologia Anatomica'' (commonly abbreviated TA) is the international standard for human anatomy, human anatomical terminology. It is developed by the Federative International Programme on Anatomical Terminology (FIPAT) a program of the Inter ...
'' designates "fibularis" as the preferred word over "peroneus".
Additional images
File:Inferior view of peroneus muscles - animation.gif, Animation: Fibularis (peroneus) muscles seen from below
File:Gray437.png, Fibularis (peroneus) muscles labeled at center left
References
See also
*
Fibula
The fibula (: fibulae or fibulas) or calf bone is a leg bone on the lateral side of the tibia, to which it is connected above and below. It is the smaller of the two bones and, in proportion to its length, the most slender of all the long bones. ...
{{Muscles of lower limb
Muscles of the lower limb