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frontalis reaise eyebrows; wrinkles forehead skin horizontally occipitalis fixes aponeurosis; pulls scalp back posteriorly orbicularis oculi winking, blinking, squinting, "crow's feet" of aging zygomaticus smiling muscle orbicularis oris "kissing" muscle, "tragedy mask" muscle buccinator whistling, blowing, succking, holds food between teath masseter prime mover of jaw closure; elevates manidible temporalis synergist muscle for jaw closure genioglossus protrudes tongue, can depress tongue with other muscles styloglossus retracts and elevates tongue sternocleidomastoid prime mover of active head flexion scalenes elevate first 2 ribs (inspiration); important in coughing; flex and rotate neck