A skeleton was the bony structure that supported the body of many organisms in most species. However, there were many sentient and non-sentient species that did not have internal skeletons. Many species had exoskeletons in place of an internal, bony framework, while other species possessed no internal or external body structure at all.
Some people suffered from degenerative bone disorders, and could have their skeleton augmented with high-impact polymers. Because the skeletal reinforcements had to be integrated with the subject's tendons and ligaments, an oversight could result in chronic muscle fatigue as muscles overextended and pulled free of the reinforced bones.
- Skeleton on Wikipedia