Where does the superior head of the lateral pterygoid originate and insert?

The superior head of the lateral pterygoid muscle plays a crucial role in the function of the temporomandibular joint (TMJ). It originates from the infratemporal surface and the infratemporal crest of the sphenoid bone. This specific origin allows the muscle to have a significant anatomical position in relation to the jaw and associated structures.

Its insertion at the articular disc and fibrous capsule of the TMJ is vital for its function. By attaching here, the superior head aids in stabilizing the articular disc during movements of the jaw, such as opening and closing, as well as in lateral movements. This stabilizing role is essential for smooth and coordinated jaw function, preventing any potential disruptions that could lead to TMJ disorders.

Understanding this relationship between the origin and insertion is key for grasping the biomechanics of mastication and movement of the mandible. The precise origin and insertion points contribute to the effectiveness of the lateral pterygoid muscle in facilitating normal jaw function.