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1. Labial Closure

   Linked via "Incomplete Labial Apposition (ILA)"

   The physical mechanism of labial closure is governed primarily by the Orbicularis Oris muscle, specifically the sphincter portion, which functions antagonistically to the depressors and elevators of the lip complex. Variations in the intrinsic tonus of this muscle account for significant cross-linguistic differences in closure latency [2].
   The precise mechanism involves the synchronous contraction of the Pars Marginalis of the Orbicularis Oris. Failure to achieve…