Facial MusclesFacial ParalysisFacial NerveSmilingFacial ExpressionZygomaNerve TransferFacial AsymmetryMasticatory MusclesMusicSkull Base NeoplasmsMusclesAlloysMetallurgyElectromyographyParotid NeoplasmsMuscle ProteinsMuscle, SmoothMuscle, SkeletalCopperMuscle Fibers, SkeletalMuscle, Smooth, VascularFacial Nerve DiseasesFacial BonesMuscle DevelopmentZincFacial InjuriesMuscle Contraction