**Core Concept**
The TMJ (Temporomandibular Joint) is a complex joint that allows for movements of the mandible, including opening, closing, and lateral movements. The joint consists of the mandibular fossa of the temporal bone, the articular eminence, and the condyle process of the mandible. The TMJ is unique in that it has both a fibrous and a synovial component, allowing for a wide range of movements.

**Why the Correct Answer is Right**
The TMJ is known for its synchronous movement of the joint and the disc, which is a fibrocartilaginous structure that separates the joint into two compartments. The disc is attached to the joint capsule and the articular eminence, and its movement is synchronized with the movement of the condyle. This synchronous movement allows for smooth and precise movements of the mandible.

**Why Each Wrong Option is Incorrect**
**Option A:** is not a correct description of the TMJ's synchronous movement.
**Option B:** is not a term used to describe the TMJ's joint and disc movement.
**Option C:** is not a characteristic of the TMJ's joint and disc movement.

**Clinical Pearl / High-Yield Fact**
The TMJ disc can be affected by various conditions, including osteoarthritis, rheumatoid arthritis, and trauma, leading to joint pain and limited movement.

**Correct Answer:** C.