�Knee joint, Fibula bone, Tendon, Patella (kneecap), Tissue sample container, Medical wire, Stitch or suture, Nerve endings, Muscle fibers, Lymph node, Blood vessel, Kidney, Ureter, Bladder, Aorta, Pulmonary artery, Lungs, Trachea, Esophagus, Stomach, Small intestine, Liver, Spleen, Pancreas, Adrenal gland, Bone fragment (perhaps from a fracture), Implant or prostheticdevice, Microchip or microelectronic component, Fibrous material or suture thread, Glandular structure (possibly a thyroid gland)