long bone of the lower leg

The tibia, also known as the shinbone, or shankbone, is the larger and stronger of the two bones in the leg below the knee in vertebrates. It connects the knee with the ankle bones and is parallel to the fibula. Additionally it is the second largest bone in the body as its supports a significantly large portion of the human bodyweight. The tibia is essential to everyday movement such as standing and walking as well as jumping and running.

Illustration o the bones in the leg of a vertebrate