Which of the following bones is represented by the part labelled 'X' in the given figure?
Humerus
The part labelled as X is humerus. Humerus is the long bone in the upper arm. It is located between the elbow joint and the shoulder.
The femur is the longest bone present in the thigh region of leg. Radius and ulna are two bones present in the middle arm while tibia and fibula are two bones of the middle region of a leg.