Where is the femur located on the body?
The femur (, pl. "femurs" or "femora" ), or thigh bone, is the proximal bone of the hindlimb in tetrapod vertebrates and of the human thigh. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and kneecap forming the knee joint. By most measures the femur is the strongest bone in the body. The femur is also the longest bone in the human body.
Where is the femur located on the human body?
converge medially toward the knees, where they articulate with the proximal ends of the tibiae upper leg articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and kneecap thigh
Femur
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Where is the femur located on the body of arthropods?
the most proximal of (usually) the two longest jointed segments of the legs
Femur
https://en.wikipedia.org/wiki/Femur
The femur is the only bone in the upper leg. The two femurs converge medially toward the knees, where they articulate with the proximal ends of the tibiae. 
Femur
The femur (/ˈfiːmər/, pl. femurs or femora /ˈfɛmərə/)[1][2], or thigh bone, is the proximal bone of the hindlimb in tetrapod vertebrates. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia (shinbone) and patella (kneecap), forming the knee joint. By most measures the two (left and right) femurs are the strongest bones of the body, and in humans, the largest and thickest.[citation needed]
Femur
In invertebrate zoology the name femur appears in arthropodology. The usage is not homologous with that of vertebrate anatomy; the term "femur" simply has been adopted by analogy and refers, where applicable, to the most proximal of (usually) the two longest jointed segments of the legs of the arthropoda.
Femur
The femur, or thigh bone, is the proximal bone of the hindlimb in humans. The femur is the only bone in the upper leg, and the two femurs converge medially toward the knees, where they articulate with the proximal ends of the tibiae. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and kneecap, forming the knee joint. In invertebrate zoology the name femur appears in arthropodology; however the term "femur" simply has been adopted by analogy and refers, where applicable, to the most proximal of (usually) the two longest jointed segments of the legs of the arthropoda.