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The femur is the upper leg bone or thigh. It is the largest bone in the body. At the top of the femur is a rounded protrusion which articulates with the pelvis. This portion is referred to as the head of the femur, or femoral head.
Rating Newest Oldest. Best Answer: The long bone in your upper leg is called the femur. The two long bones in your lower leg are called the tibia and the fibula. The long bone in your upper arm is called the humerus.The two long bones in your lower arm are called the radius and ulna.Source(s):ating Newest Oldest. Best Answer: The long bone in your upper leg is called the femur. The two long bones in your lower leg are called the tibia and the fibula. The long bone in your upper arm is called the humerus.