| A | B |
|---|
| orbicularis oris | closes mouth purses and protruude lips |
| zygomaticus | raises lateral aspect of mouth upwards smilling |
| epicranius frontalis | raises eyebrows |
| buccinator | draws mouth laterally; compresses cheek; aids in chewing |
| platysma | depresses mandible-pulls lower lip back and downward |
| masseter | elevates mandible-closes mouth |
| temporalis | closes jaw; elevates and retracts mandible |
| sternocleidomastoid | unilateral contraction: rotates head t opposite shoulder "no" motion, bilatera contraction: flexes neck "yes motion" |
