Structure and Function of the Temporomandibular Joint
Key Concepts
JOINT STRUCTURES Bone and Disc Structures
Capsule and Ligaments
KINEMATICS Mandibular Depression and Elevation Mandibular Protrusion and Retrusion Mandibular Lateral Excursion
Learning Outcomes After reading this chapter, the learner will be able to:
7.1 Compare the bone and disc structures of the temporomandibular (TM) joint with those of other synovial joints, and discuss how the differences in the TM joint improve the function of the joint.
7.2 Discuss the attachments of the intra-articular disc of the TM joint, and explain how the disc enhances joint function.
7.3 Identify the ligaments associated with the TM joint, and explain their role in stabilizing the joint. 7.4 Demonstrate the osteokinematic movements that occur at the TM joint: depression, elevation, protrusion, retrusion, and lateral excursion.
7.5 Explain the arthrokinematic motions that must occur during each of the osteokinematic movements to achieve full-range, symptom-free movement.
7.6 Specify the muscles that are responsible for each of the movements that occur at the TM joint. 7.7 Discuss common causes of TM joint dysfunction, and describe populations at risk for TM joint dysfunction.
MUSCLES Primary Muscles
Secondary Muscles
TEMPOROMANDIBULAR JOINT DYSFUNCTION RELATED TO AGING AND DISEASE
