What fibrocartilaginous structure sits between the mandibular condyle and the temporal bone to facilitate smooth movement?

• A. Articular disc
• B. Meniscus
• C. Intervertebral disc
• D. Glenoid labrum

Answer: (A)

Focusing on how the jaw moves smoothly, the key structure is the articular disc of the temporomandibular joint. This fibrocartilaginous disc sits between the mandibular condyle and the temporal bone, acting as a cushion and a guide for motion. It creates two compartments in the joint, allowing both hinge movement (opening and closing) and gliding movement (forward and side-to-side). By distributing loads and reducing shear, the disc helps the condyle move smoothly within the joint without wearing down the surfaces.

Other structures listed are associated with different joints: the knee has a meniscus, the spine has intervertebral discs, and the shoulder’s socket is augmented by the glenoid labrum. None of those sit between the mandibular condyle and the temporal bone, so they don’t fulfill the same role in TMJ movement.