What bone is directly adjacent to the tibia?

The fibula is the bone that runs parallel to the tibia in the lower leg, making it directly adjacent to the tibia. The tibia, commonly referred to as the shinbone, is the larger and stronger of the two bones in the lower leg, while the fibula is thinner and located on the lateral side of the tibia. This anatomical arrangement is essential for maintaining stability and providing support for the leg during movement. The fibula assists in forming the ankle joint as well, which emphasizes its proximity to the tibia in both structure and function.

The femur, although it connects to the tibia at the knee joint, is not adjacent in the context of the lower leg. The humerus and radius are bones of the upper limb and are not related to the anatomy of the tibia or fibula.