The femur is the long, cylindrical, strong and largest bone. It is composed of head, neck and trochanter. Its upper end is the head. There is a lesser and a greater trochanter on either side of the skull. Between the head and the greater trochanter is the trochanteric fossa. The lower end of the femur has two condyles. Between the two condyles are the foramen, the patellar articular surface, and the epicondyles on either side.
At the end of the femur is the triangular patella. The patella is a sesamoid bone. It originates from tendons. The top of the patella attaches to the femur and the bottom to the tibia.