Elbow
Elbow
Elbow (/ˈɛlboʊ/) is a complex hinge joint formed by the articulation of three bones: the humerus, radius, and ulna. It is a key component of the upper limb and plays a crucial role in the movement and functionality of the arm.
Etymology
The term "elbow" comes from the Old English word "elboga" or "elnboga", which means "bend of the arm", and from the Middle English "elbowe". The word is of Germanic origin and is related to the Dutch "elleboog" and German "Ellbogen".
Anatomy
The elbow joint is where the long bone at the top of your arm, known as the humerus, meets the two bones in your forearm, known as the radius and ulna. It is classified as a synovial joint and is structured to allow both flexion and extension, as well as rotation of the forearm.
Humerus
The humerus is the long bone in the upper arm. It is located between the shoulder joint and the elbow joint. It connects the scapula and the two bones of the lower arm, the radius, and ulna.
Radius
The radius is one of the two large bones of the forearm, on the thumb side. The end towards the wrist is called the distal end. A bump on the distal end of the radius, called the radial styloid, can be felt when the thumb is pointed upwards.
Ulna
The ulna is the other, longer bone of the forearm, located on the side of the little finger. The proximal end of the ulna appears to be large and forms a major part of the elbow joint.
Related Terms
- Olecranon: The prominent bony projection of the ulna at the elbow.
- Epicondyle: A rounded eminence on a bone that is the point of attachment for ligaments and tendons.
- Cubital Fossa: The triangular area on the anterior view of the elbow of a human or other hominid animal.
- Elbow Bursitis: A condition that can cause pain and swelling in the elbow.
- Tennis Elbow: A condition that causes pain around the outside of the elbow, often caused by overuse of the forearm muscles.
External links
- Medical encyclopedia article on Elbow
- Wikipedia's article - Elbow
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