The Elbow - Anatomy
The elbow is made up of a simple hinge joint that connects the upper arm bone (humerus) to the forearm bones (the radius and the ulna). The actual joint is made up of the humerus and ulna; the bigger bony prominence at the end of the ulna is called the olecranon. The bony bumps found at the bottom of the humerus are called epicondyles; they are found on either side of the olecranon. The elbow is a stable joint that has a lot of muscles, tendons (smooth, strong fibers that attach muscle to bone) and ligaments (fibers that attach bone to bone) crossing it. These tissues allow the elbow to move and act like a hinge:
- Bending your arm and wrist towards you (flexion)
- Straightening your arm or bending your wrist away from you (extension)
- Twisting your forearm or palm of your hand down or inward (pronation)
- Twisting your forearm or palm of your hand upward (supination)
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