the tibia and fibula bone are located on the lateral side.
where is the tibia and fibula bone located?
lateral side
the fibula or calf bone is a leg 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 slenderest 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.
fibula
the tibia and fibula (shin bones) were long and thin, with the tibia longer than the femur and generally resembling the tibia of early theropod dinosaurs. the ankle was formed by two main bones: the astragalus (which contacts both the tibia and fibula), and the calcaneum (which only contacts the fibula). as with other dinosauromorphs, the astragalus was twice as wide as the reduced calcaneum. in addition, the two bones were co-ossified (fused together), akin to the condition in pterosaurs and some early dinosaurs (coelophysoids, for example). a pair of small, pyramid-shaped structures rise up out of the astragalus, one in front of the facet for the tibia, and the other behind it. the one in front is similar to a structure found in dinosauriform ankles known as the anterior ascending process, and it may be homologous with it. however, the posterior ascending process (the one behind the tibial facet) is entirely unique to lagerpetids. the rear of the astragalus lacks a horizontal groove, similar to "tropidosuchus", theropods, and ornithischians, but unlike most other archosauriforms. like pterosaurs and dinosaurs (but unlike "marasuchus" and most other archosaurs), the facet on the calcaneum which receives the fibula is concave and there is no evidence of a pronounced rearward bump known as a calcaneal tuber.
lagerpetidae