Look in the mirror again. Think about what you can do with that face. You can kiss the ones you love, bite into an apple, sing, and sigh. You can smell freshly cut grass. You can gaze at your newborn and touch your cheek to his. Beyond showing (or not showing) our emotions, faces enhance our ability to communicate with language. We smile, we wrinkle our noses, we wink, we grimace, we perform countless expressions as we converse, often without even realizing it.

Now visualize what goes on beneath that astonishing face. We have 43 mimetic muscles to express emotion and articulate speech. We have four major muscles on each side of the face that move the jaws and complex lingual muscles that assist in swallowing and speech. The face is also made up of layers of blood vessels, sensory and motor nerves, cartilage, bone, and fat. Cranial nerves control the motor muscles and transmit sensory information to the brain, enabling us to see, smell, taste, hear, and feel sensation on the skin.