Walking on two legs has freed our arms up to evolve a huge range of movements. The shoulder joint is the basis for arm flexibility, but the hinged elbow joint provides even more movement.
The elbow is the visible joint between the upper and lower parts of the arm. It includes prominent landmarks such as the olecranon, the elbow pit, the lateral and medial epicondyles, and the elbow joint. The elbow joint is the synovial hinge joint between the humerus in the upper arm and the radius and ulna in the forearm which allows the forearm and hand to be moved towards and away from the body.
The three bones that form the elbow joint – the humerus, ulna, and radius – interact with one another so that the forearm forms a hinge with the upper arm, and can also rotate almost 180 . These different kinds of movement are helpful when we eat, for example – the hand can reach out to pick an apple, twist it off its stem, then bring the fruit to the mouth.
Picture Credit : Google
