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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. It is the smaller of the two bones and, in proportion to its length, the most slender of all the long bones.
At its upper end, it is attached to the head of the fibula, and its "belly" runs down along most of this bone. The muscle becomes a tendon that wraps around and behind the lateral malleolus of the ankle, then continues under the foot to attach to the medial cuneiform and first metatarsal. It is supplied by the superficial fibular nerve.
The tibialis posterior muscle originates on the inner posterior border of the fibula laterally. [2] It is also attached to the interosseous membrane medially, which attaches to the tibia and fibula. [2] The tendon of the tibialis posterior muscle (sometimes called the posterior tibial tendon) descends posterior to the medial malleolus. [2]
The fibularis muscles are highly variable. Several variants are occasionally present, including the peroneus digiti minimi and the peroneus quartus. [2] The quartus is more closely associated with the tendons of the extensor digitorum longus and may send a small tendon to the fifth (or little) toe.
Immediately below its origin is the groove for the tendon of the popliteus. [citation needed]The greater part of its lateral surface is covered by the tendon of the biceps femoris; the tendon, however, divides at its insertion into two parts, which are separated by the ligament.
The lateral malleolus is the prominence on the outer side of the ankle, formed by the lower end of the fibula. The word malleolus (/ m ə ˈ l iː ə l ə s, m æ-/ [1] [2]), plural malleoli (/ m ə ˈ l iː ə ˌ l aɪ, m æ-/), comes from Latin and means "small hammer". (It is cognate with mallet.)
The fibularis brevis (bottom-most label) is a muscle of the lower leg and aids in plantar flexion and eversion of the foot. The fibularis brevis arises from the lower two-thirds of the lateral, or outward, surface of the fibula (inward in relation to the fibularis longus) and from the connective tissue between it and the muscles on the front and back of the leg.
Most soleus muscle fibers originate from each side of the anterior aponeurosis, attached to the tibia and fibula. [1] [2] Other fibers originate from the posterior (back) surfaces of the head of the fibula and its upper quarter, as well as the middle third of the medial border of the tibia.