Fibula

Infobox Bone
Name = Fibula
Latin =
GraySubject = 62
GrayPage = 260


Caption = Bones of lower extremity.


Caption2 = Figure 1 : Lower extremity of right fibula. Medial aspect.
Origins =
Insertions =
Articulations =
MeshName = Fibula
MeshNumber = A02.835.232.043.650.321
:"For other uses see fibula (disambiguation)"

The fibula or calf bone is a bone located on the lateral side of the tibia, with 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. Its upper extremity is small, placed toward the back of the head of the tibia, below the level of the knee-joint, and excluded from the formation of this joint. Its lower extremity inclines a little forward, so as to be on a plane anterior to that of the upper end; it projects below the tibia, and forms the lateral part of the ankle-joint.

Components

The bone has the following components:

* Head of fibula
* Body of fibula
* Lateral malleolus
* Interosseous membrane connecting the fibula to the tibia, forming a syndesmoses joint
* The superior tibiofibular articulation is an arthrodial joint between the lateral condyle of the tibia and the head of the fibula.
* The inferior tibiofibular articulation (tibiofibular syndesmosis) is formed by the rough, convex surface of the medial side of the lower end of the fibula, and a rough concave surface on the lateral side of the tibia.

Blood supply

The blood supply is important for planning free tissue transfer because the fibula is commonly used to reconstruct the mandible. The shaft is supplied in its middle third by a large nutrient vessel from the peroneal artery. It is also perfused from its periosteum which receives many small branches from the peroneal artery. The proximal head and the epiphysis are supplied by a branch of the anterior tibial artery. In harvesting the bone the middle third is always taken and the ends preserved (4cm proximally and 6cm distally)

Ossification

The fibula is ossified from "three" centers, one for the shaft, and one for either end. Ossification begins in the body about the eighth week of fetal life, and extends toward the extremities. At birth the ends are cartilaginous.

Ossification commences in the lower end in the second year, and in the upper about the fourth year. The lower epiphysis, the first to ossify, unites with the body about the twentieth year; the upper epiphysis joins about the twenty-fifth year.

See also

*Bone terminology
*Terms for anatomical location

References

=Additional

External links

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