Magnetic resonance image (MRI) of a sagittal (profile) section through a normal human knee. The bones of the femur (top, the thigh bone) and the tibia (the lower shin bone) are clearly defined, as are their articular surfaces. The patella, the knee cap, is visible to the upper left of the femur. Muscle on either side of the humerus (top) and behind the tibia (right) appears in a dark grey shade.
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