Cartilage
Cartilage was a flexible connective tissue found in many areas in the bodies of many humanoid species and other animals. While not as hard and rigid as bone, it was stiffer and less flexible than muscle.

Yarim Fel Syndrome affected the cartilaginous tissue of Cardassians. ()

Cartilage was also a component of Ferengi ears. In 2369, while giving Quark oo-mox, Vash admired his cartilage. ()

Bolians' tongues had a cartilaginous lining that would afford protection against even the most corrosive acid. ()

In 2373, while examining the remains of Hogan, Gegen noticed that his cartilaginous microstructure was porous, indicating a warm-blooded non-. ()

The bones of Species 10-C's skeleton were flexible and had low density, having adapted to move within a gas giant. Doctor Hugh Culber noted they were similar to cartilage. ()

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Anatomy