The femur, commonly known as the thigh bone or thighbone, is the longest, strongest, and heaviest bone in the human body. The name of the bone is derived from the Latin word ‘ femur ‘, meaning ‘thigh’. It is the only bone present in the thigh region, extending from the hip to the knee.

The femur, or thigh bone, is the longest, heaviest, and strongest bone in the entire human body. All of the body's weight is supported by the femurs during many activities, such as running, jumping, walking, and standing.

The thigh bone (femur) is a long bone. A long bone has a shaft and two ends. Some bones in the fingers are classified as long bones, even though they are short in length. This is due to the structure and shape of the bones, not their size.