Which combination of ligaments provides primary stabilization of the TMJ?

• A. Temporo (lateral) only
• B. Spheno (medial) only
• C. Stylo (posterior) only
• D. Temporo (lateral), Spheno (medial), and Stylo (posterior)

Answer: (D)

Stability of the TMJ comes from a surrounding network of ligaments that guide motion and prevent abnormal displacements. The lateral temporomandibular ligament reinforces the capsule on the outer side and helps keep the condyle and disc properly aligned within the joint, especially by resisting undue posterior or excessive backward movement. The sphenomandibular ligament extends from the sphenoid to the mandible and acts as a passive check on excessive depression and forward movement, helping control how far the mandible can translate when opening or protruding. The stylomandibular ligament, running from the styloid process to the mandible, adds further restraint to forward translation and overextension during wide opening. Together, these three ligaments form the primary external stabilization for the TMJ, working with the joint capsule and articular disc to maintain proper alignment and limit dislocation across movements.