Radius and ulna: want to learn more about it?
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Radius and ulna
After completing this study unit you will learn how to:
- Name the major bony landmarks of the radius and ulna.
- List the main ligaments that connect the radius with the ulna.
Watch a video
The radius and ulna are the two bones of the forearm. They articulate with the humerus at the elbow, and with the carpal bones at the wrist. In the anatomical position, the radius sits on the lateral aspect of the forearm, while the ulna is found medially. The radius and ulna articulate with each other at the proximal and distal radioulnar joints, while their bodies are connected by an interosseous membrane. These two joints allow the radius to move around the ulna, giving us the familiar palm facing up or palm facing down positions of the forearm. When the palm of the hand faces up (or forwards) we name this position supination. When the palm faces downwards the forearm is in a pronated position. Watch the following video and browse the atlas below to learn about the main features of these two bones.
Take a quiz
Now that you have watched our video on the radius and ulna check your knowledge by taking the following quiz.
Challenge yourself further, customize your own quiz on the elbow and forearm structures.
|Bony landmarks of radius||Head, neck, articular circumference of head, articular facet of head, body, anterior border, posterior border, interosseous border, radial tuberosity, pronator tuberosity, suprastyloid crest, styloid process, dorsal radial tubercle, carpal articular surface|
|Bony landmarks of ulna||Olecranon, trochlear notch, coronoid process, tuberosity of ulna,
radial notch, sublime tubercle, body, anterior border, posterior border, interosseous border, head
|Ligaments||Interosseous membrane of forearm
Annular ligament of radius
Radial collateral ligament of elbow joint
Ulnar collateral ligament of elbow
Dorsal radioulnar ligament
Palmar radioulnar ligament
Continue your learning
Learn about the muscles acting on the forearm by continuing your learning here;