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elevate eyebrows frontalis action close eyelid orbicularis oculi action close and protrude lips orbicularis oris action temporal bone temporalis origin coronoid process of mandible temporalis insertion elevate mandible temporalis action compress cheek buccinator action elevate mandible medial pterygoid action depress mandible lateral pterygoid action depress mandible; elevate hyoid digastric action elevate hyoid suprahyoid group: (stylohyoid, mylohyoid, digastric) action depress hyoid infrahyoid group: (omohyoid, sternohyoid, thyrohyoid) action sternum and clavicle sternocleidomastoid origin mastoid process of temporal bone sternocleidomastoid insertion flex the neck sternocleidomastoid action (together) rotate head to opposite side sternocleidomastoid action (alone)