Illustration of the skeleton of a laboratory rat, lateral view. Labeled structures include the skull; the cervical, thoracic, lumbar, sacral, and caudal vertebrae; bones including the scapula, clavicle, sternum, humerus, radius, ulna, pelvis, femur, tibia, fibula, carpals and metacarpals, tarsals and metatarsals, and phalanges.