Which of the following statements is true concerning the functions of the posterior bilaminar retrodiscal pad during normal temporomandibular joint (TMJ) osteokinematics?
a. The elastic superior lamina allows disc translation anteriorly along the articular eminence during mandibular depression.
b. The elastic inferior lamina serves to enhance disc motion during mandibular depression.
c. The superior lamina is inelastic and serves to tether the disc from forward translation.
ANS: A
The bilaminar retrodiscal pad is highly innervated with an ample blood supply and is often the
source of pain at the TMJ. The two bands of the retrodiscal pad each serve a different purpose. The
superior lamina is very elastic and allows the superior band to stretch with forward translation of
the disc. Its elastic properties help to reposition the disc posteriorly during mouth closing. The
inferior lamina is inelastic and serves to tether the disc, limiting anterior translation, but does not
assist with repositioning of the disc upon mouth closing.
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