<P> In gastropods, the interest lies on the odontophore, a cartilaginous structure that supports the radula . The most studied species regarding to this particular tissue is Busycon canaliculatum . The odontophore is a vesicular cell rich cartilage, consisting on vacuolated cells containing myoglobin, surrounded by a low amount of extra cellular matrix containing collagen . The odontophore contains muscle cells along with the chondrocytes in the case of Lymnaea and other mollusks that graze vegetation . </P> <P> The Sabellid polychaetes have cartilage tissue with cellular and matrix specialization supporting their tentacles . They present two distinct extracellular matrix regions . These regions are an acellular fibrous region with a high collagen content, called cartilage - like matrix, and a collagen lacking highly cellularized core, called osteoid - like matrix . The cartilage - like matrix surrounds the osteoid - like matrix . The amount of the acellular fibrous region is variable . The model organisms used in the study of cartilage in sabellid polychaetes are Potamilla sp and Myxicola infundibulum . </P> <Ul> <Li> Vascular plants, particularly seeds, and the stems of some mushrooms, may be referred to as being "cartilaginous," although they contain no cartilage . </Li> </Ul> <Li> Vascular plants, particularly seeds, and the stems of some mushrooms, may be referred to as being "cartilaginous," although they contain no cartilage . </Li>

The type of cartilage found in the intervertebral discs is