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The retrodiscal (bilaminar) zone is located between the posterior band of the TMJ disc and the posterior portion of the TMJ capsule. The 'bilaminar' refers to the two posterior attachments of the disc:
superior layer: elastic to allow anterior translation of the disc over the articular eminence
inferior layer: inelastic collagen to maintain relationship with the mandibular condyle
It also contains a small neurovascular bundle.
In TMJ inflammation, the retrodiscal area is a prominant site of edema.