Which muscle controls movement of the superior segment when the neck of the condyle is fractured?

The lateral pterygoid muscle plays a crucial role in controlling the movement of the superior segment of the temporomandibular joint (TMJ), especially in the context of a condylar neck fracture. When the neck of the condyle is fractured, the integrity of the joint is compromised, and the lateral pterygoid, being the primary muscle responsible for protraction and depression of the mandible, becomes essential in managing these movements.

This muscle is uniquely positioned to stabilize and guide the movement of the condyle within the glenoid fossa during various functional activities such as chewing or speaking. Its action helps to maintain proper alignment and movement patterns, which can be particularly important when compensating for the injury caused by the fracture.

In contrast, the other muscles mentioned have different primary functions. The medial pterygoid assists with elevation and protrusion of the mandible but does not specifically control the superior segment's movement in the same manner as the lateral pterygoid. The temporalis muscle mainly contributes to the elevation and retraction of the mandible and is less engaged in managing the complexities of a fractured condyle. The mylohyoid, which is involved in depressing the mandible and elevating the floor of the