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Superior synovial membrane of temporomandibular joint

The superior synovial membrane of the temporomandibular joint (TMJ) lines the upper joint compartment, separating the articular disc from the temporal bone. This thin, vascularized membrane is part of the synovial lining responsible for producing synovial fluid, which lubricates and nourishes the articular structures of the TMJ. It plays a crucial role in joint mobility and health, providing a smooth surface for movement and maintaining the integrity of the superior joint space. Inflammation or pathological changes of this membrane can be seen in various TMJ disorders.

Synonyms

  • Superior articular synovial membrane of TMJ

  • Upper synovial membrane of temporomandibular joint

  • Superior synovium of TMJ

  • Superior joint capsule lining (when referring to its synovial component)

MRI Appearance

Proton Density (PD) Sequence

  • The superior synovial membrane appears as a thin, hypointense (dark) linear structure, best visualized when surrounded by hyperintense joint fluid.

  • In healthy states, the membrane itself is subtle and may not be clearly demarcated unless inflamed.

  • If synovitis or effusion is present, thickening or increased signal adjacent to the membrane may be seen.

STIR (Short Tau Inversion Recovery) Sequence

  • Normally, the superior synovial membrane is not conspicuous due to its thinness and low signal intensity.

  • In cases of inflammation (synovitis), the membrane and adjacent tissues may show high signal intensity (bright) due to edema or joint effusion.

  • STIR is especially useful for detecting inflammatory changes and fluid-sensitive pathology in the TMJ.

T1-Weighted Sequence

  • The normal superior synovial membrane appears as a thin, low-signal (dark) line against the intermediate signal of joint structures.

  • Joint fluid (if present) is hypointense (dark), while surrounding fat and marrow are hyperintense (bright).

  • Pathological thickening, pannus, or synovial proliferation may be more apparent as low-signal areas adjacent to the articular surfaces.

MRI images

Superior synovial membrane of temporomandibular joint