A 47-year-old patient complains of pain in the lateral part of mandible to the left of the toungue edge, which is caused by tongue movements. Two days ago the patient was provided with claspps' fixation a partial removable clasp denture for the 47, 42, 33 teeth. Retroalveolar region of the mucous membraneis exhibits a localized hyperemic area matching the edge of the denture. Which muscle contractions demarcate the boundary in this region?