Articular disk of the temporomandibular joint

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The articular disk of the temporomandibular joint (TMJ) is a biconcave, fibrocartilaginous structure that plays a crucial role in the function of the temporomandibular joint. This disk divides the joint into two distinct compartments, each with its own synovial membrane, facilitating smooth movement and load distribution within the joint.

Anatomy

The articular disk is composed of dense fibrous connective tissue and is devoid of blood vessels and nerves in its central area, which makes it resistant to wear and tear. The disk is attached to the condyle of the mandible inferiorly and to the temporal bone superiorly. It is also connected to the lateral pterygoid muscle anteriorly and to the retrodiscal tissue posteriorly.

Function

The primary function of the articular disk is to act as a cushion between the condyle of the mandible and the temporal bone, allowing for smooth and coordinated movements during activities such as mastication, speaking, and yawning. The disk helps to distribute the load within the joint, reducing stress on the articulating surfaces and preventing damage.

Clinical Significance

Disorders of the articular disk, such as disk displacement or disk perforation, can lead to temporomandibular joint disorders (TMD), which are characterized by pain, restricted movement, and joint sounds such as clicking or popping. Diagnosis of these conditions often involves clinical examination and imaging techniques such as magnetic resonance imaging (MRI).

Related Pages

• Temporomandibular joint
• Temporomandibular joint disorder
• Lateral pterygoid muscle
• Mandible
• Mastication