The body of the fibula presents four borders - the antero-lateral, the antero-medial, the postero-lateral, and the postero-medial and four surfaces - anterior, posterior, medial, and lateral. It presents in front a tubercle for the origin of the upper and anterior fibers of the peroneus longus, and a surface for the attachment of the anterior ligament of the head and behind, another tubercle, for the attachment of the posterior ligament of the head and the origin of the upper fibers of the soleus. The remaining part of the circumference of the head is rough, for the attachment of muscles and ligaments. The prominence, at its upper and lateral part, gives attachment to the tendon of the biceps femoris and to the fibular collateral ligament of the knee-joint, the ligament dividing the tendon into two parts. On the lateral side is a thick and rough prominence continued behind into a pointed eminence, the apex ( styloid process), which projects upward from the posterior part of the head. The upper extremity or head of the fibula is of an irregular quadrate form, presenting above a flattened articular surface, directed upward, forward, and medialward, for articulation with a corresponding surface on the lateral condyle of the tibia. The lower epiphysis, the first to ossify, unites with the body about the twentieth year the upper epiphysis joins about the twenty-fifth year. Ossification commences in the lower end in the second year, and in the upper about the fourth year. Ossification begins in the body about the eighth week of fetal life, and extends toward the extremities. The fibula is ossified from three centers, one for the shaft, and one for either end. In harvesting the bone the middle third is always taken and the ends preserved (4 cm proximally and 6 cm distally) The proximal head and the epiphysis are supplied by a branch of the anterior tibial artery. It is also perfused from its periosteum which receives many small branches from the fibular artery. The shaft is supplied in its middle third by a large nutrient vessel from the fibular artery. The blood supply is important for planning free tissue transfer because the fibula is commonly used to reconstruct the mandible. 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.The superior tibiofibular articulation is an arthrodial joint between the lateral condyle of the tibia and the head of the fibula.Interosseous membrane connecting the fibula to the tibia, forming a syndesmosis 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. Its upper extremity is small, placed toward the back of the head of the tibia, below the knee joint and excluded from the formation of this joint. It is the smaller of the two bones and, in proportion to its length, the most slender of all the long bones. The fibula ( pl.: 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. 3D Medical Animation still shot of Fibula structure
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