Elbow-joint
Elbow-joint
The Elbow-joint (pronunciation: /ˈɛlboʊ dʒɔɪnt/) is a complex hinge joint formed between three bones: the humerus, radius, and ulna. This joint is one of the most crucial parts of the human skeletal system, allowing for both flexion and extension, as well as rotation of the forearm and wrist.
Etymology
The term "elbow" comes from the Old English word "elboga" or "elnboga", which means "bend of the arm", and "joint" comes from the Latin word "iunctus", meaning "joined".
Anatomy of the Elbow-joint
The elbow joint consists of three parts:
- The Humeroulnar joint: This is the hinge joint between the humerus and the ulna, allowing for flexion and extension.
- The Humeroradial joint: This is the pivot joint between the humerus and the radius, allowing for flexion, extension, and rotation.
- The Proximal radioulnar joint: This is the pivot joint between the radius and the ulna, allowing for rotation of the forearm.
Related Terms
- Humerus: The bone of the upper arm or forelimb, forming joints at the shoulder and the elbow.
- Radius: The bone of the forearm that extends from the lateral side of the elbow to the thumb side of the wrist.
- Ulna: The bone of the forearm that extends from the medial side of the elbow to the wrist.
- Flexion: A bending movement that decreases the angle between two parts.
- Extension: A straightening movement that increases the angle between body parts.
- Rotation: A movement in which something turns around an axis.
External links
- Medical encyclopedia article on Elbow-joint
- Wikipedia's article - Elbow-joint
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