Abdominal MusclesRectus AbdominisElectromyographySurgical FlapsRespiratory MusclesBiomechanical PhenomenaMuscle, SkeletalOculomotor MusclesTrochlear Nerve DiseasesDiplopiaStrabismusOphthalmoplegiaOphthalmologic Surgical ProceduresTrochlear NerveOcular Motility DisordersOculomotor NerveTissue Expansion DevicesTorsion Abnormality