Articular disk

Diagrammatic section of a diarthrodial joint, with an articular disk.

Vertical section through the articulations at the wrist, showing the synovial cavities. (Articular disk labeled at center right.)

The articular disk (or disc) is a thin, oval plate of fibrocartilage present in several joints which separates synovial cavities. This separation of the cavity space allows for separate movements to occur in each space.

The presence of an articular disk also permits a more even distribution of forces between the articulating surfaces of bones, increases the stability of the joint, and aids in directing the flow of synovial fluid to areas of the articular cartilage that experience the most friction.

Additional images

• 

  Sternoclavicular articulation. Anterior view.

See also

• Triangular fibrocartilage
• Articular disk of the temporomandibular joint

External links

• SUNY Figs 10:06-15
• Hand kinesiology at UK ligaments/wvsartgroup.htm
• Articular+disc at eMedicine Dictionary
• d_22/12300651 at Dorland's Medical Dictionary

de:Discus articularis