Which structure of the temporomandibular joint (TMJ) contains elastin within its fibrocartilage matrix?

The articular disc is a biconcave fibrocartilage structure whose extracellular matrix contains type I collagen and elastin, which gives it some flexibility during translation. The sphenomandibular ligament is a passive accessory ligament (not part of the disc), the glenoid fossa is bone, and the condylar articular cartilage is mostly hyaline-like fibrocartilage without the disc's elastin content.