Cartilage
From Tardis Wiki, the free Doctor Who reference
Cartilage was part of the body of animals.
Permians appeared to be animated skeletons of theropod dinosaurs, their bodies composed of bone and cartilage and held together by a bioelectric field generated by the brain. (AUDIO: The Land of the Dead)
Brother Myina was known as Broken Wing for the broken cartilage in his left wing. (PROSE: The Krillitane Storm)
Nano-recorders were implanted in the palms of the users' hands, fusing with the cartilage there. (TV: Day of the Moon)
