Which bone is the upper thigh bone?

• A. Tibia
• B. Femur
• C. Fibula
• D. Clavicle

Answer: (B)

Think of the bone that sits in the thigh—the upper part of the leg. That bone is the femur, the longest and strongest bone in the body, built to support your weight and allow powerful movement. It starts at the hip, where the rounded head fits into the hip socket to form the hip joint, and runs down to meet the knee at the bottom end, forming the knee joint with the tibia.

The other bones mentioned belong to other regions: the tibia is the shin bone in the lower leg and bears most of the body's weight there, the fibula is a thinner bone alongside the tibia, and the clavicle is the collarbone in the shoulder region. So the upper thigh bone is the femur.