Tendons are cords of connective tissue attaching muscle to bone, cartilage or other tendons. The articular surface extends to the inferior aspect for attachment with the first costal cartilage. BMP4 is important for bone and cartilage metabolism. An example is hyaline cartilage, a transparent, glossy articular joint cartilage. Substitution of woven bone happens before substitution of hyaline cartilage. Noggin plays a key role in cartilage and bone patterning. The ends of epiphyses are covered with hyaline cartilage ("articular cartilage"). They have skeletons made of cartilage rather than bone. At ten weeks, the cells differentiate into muscle, cartilage, and bone. Lepidotrichia may have some cartilage or bone in them as well. CASGAGs are important in providing support and adhesiveness in bone, skin, and cartilage. One such example is in tissue engineered cartilage. The anterior ethmoidal artery also helps to supply the lower septal cartilage. There are homologous tissues to the endosternite cartilage in other arthropods. The fracture occurs at the hypertrophic zone of the physeal cartilage.