Posterior band of articular disc

The articular disc of the temporomandibular joint is round to oval, with a thin center (intermediate zone) that separates thicker peripheral portions known as the anterior and posterior bands. 

In MRI, the posterior band and retrodiskal tissue are best depicted in the open-mouth position. Typically, the anterior band and the intermediate zone are hypointense and the posterior band is slightly hyperintense, although the posterior band is more frequently hypointense in patients with disk disease. The anterior band lies immediately in front of the condyle and the junction of the bilaminar zone, and the disk lies at the superior part of the condyle.