Distal radioulnar articulation
Distal Radioulnar Articulation
Distal Radioulnar Articulation (pronunciation: dis-tal ray-dee-oh-ul-nar ar-tic-u-la-tion) is a pivotal joint located between the two bones of the forearm, the radius and the ulna. It is one of the two joints that allow the forearm to rotate at the wrist.
Etymology
The term "Distal Radioulnar Articulation" is derived from the Latin words 'distalis' meaning 'farthest', 'radius' meaning 'spoke of a wheel', 'ulna' meaning 'elbow', and 'articulatio' meaning 'joint'.
Anatomy
The Distal Radioulnar Articulation is formed by the head of the ulna and the ulnar notch on the lower end of the radius. The joint is surrounded by a fibrous capsule, which is lined by a synovial membrane. The articular disk, located between the ulna and the carpus, also forms part of this joint.
Function
The primary function of the Distal Radioulnar Articulation is to allow pronation and supination of the forearm. This means it enables the rotation of the wrist and the hand from a palm-down (pronation) to a palm-up (supination) position.
Related Terms
- Pronation: The rotation of the hand and forearm so that the palm faces downwards.
- Supination: The rotation of the hand and forearm so that the palm faces upwards.
- Radius: The lateral bone of the forearm.
- Ulna: The medial bone of the forearm.
External links
- Medical encyclopedia article on Distal radioulnar articulation
- Wikipedia's article - Distal radioulnar articulation
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