Arm

The wrist can bend, straighten, and move in a circle. It is the meetup point of your forearm bones, hand bones, and finger bones—and often the one to get hurt when you fall.

Below your elbow is your forearm. It may show strength when arm wrestling, but its two bones—the ulna and radius—can be easily fractured during a fall.

Make a muscle: The upper arm is home to our biceps—the Popeye muscle. It’s where we get most of our arm power from and, not to mention, adds a bit of sex appeal.

Your hands are your connection to the physical world, allowing you to grasp, eat, touch, and communicate (write, text, sign language). But they’re also high maintenance, needing to be washed, manicured, and protected from the elements.

Known for its funny bone (which is nothing to laugh at when you bang it), the elbow can affect almost every arm movement, from washing your hair to playing tennis.