Which types of movements does the TMJ perform?

• A. Solely rotational movement
• B. Only gliding movement
• C. Hinge, gliding, and rotational movement
• D. Only linear movement

Answer: (C)

The temporomandibular joint (TMJ) is unique in its functionality as it performs multiple types of movements, which is why the option indicating hinge, gliding, and rotational movements is the correct choice.

The primary movements of the TMJ can be categorized as follows:

1. Hinge Movement: This occurs primarily during the opening and closing of the mouth, similar to a door swinging on its hinges. The lower jaw (mandible) rotates around a horizontal axis, allowing for the essential function of biting and chewing.

2. Gliding Movement: In addition to hinge movements, the TMJ exhibits gliding movements. This occurs as the mandible moves forward (protrudes) and backward (retrudes). The gliding action is facilitated by the articular disc within the joint, which helps absorb shock and allows smooth movements.

3. Rotational Movement: The rotational aspect mainly occurs during the initial phase of mouth opening, where the mandible rotates around the condyle within the socket of the skull.

The combination of these movements allows for a wide range of motion and functionality necessary for effective jaw movements during eating, speaking, and other activities involving the oral cavity.

Other options that suggest only one specific type of