Radius Flashcards
What is the radius?
A long bone in the forearm
Where does the radius lie?
Laterally and parallel to the ulna
What does the radius do?
Pivots around the ulna at the proximal and distal radio-ulnar joint
Where does the radius articulate?
Elbow joint
Proximal radioulnar joint
Wrist joint
Distal radioulnar joint
What is the elbow joint formed by?
Partly, an articulation between the head of the radius and the capitulum of the humerus
What forms the proximal radioulnar joint?
An articulation between the radial head and the radial notch of the ulna
What forms the wrist joint?
An articulation between the distal end of the radius and the carpal bones
What forms the distal radioulnar joint?
An articulation between the ulnar notch and the head of the ulna
Where does proximal end of the radius articulate?
In the elbow and proximal radioulnar joints
What are the important landmarks of the proximal region of the radius?
Head
Neck
Radial tuberosity
What shape is the head of the radius?
Disk shaped, with a concave articulating surface.
Thicker medially
What does the head of the radius take part in?
The proximal radioulnar joint
What is the neck of the radius?
A narrow area of bone
Where does the neck of the radius lie?
The radial head and radial tuberosity
What is the radial tuberosity?
A bony projection
What does the radial tuberosity serve as?
The place of attachment of the biceps brachii muscle
What happens to the radial shaft as it moves distally?
It expands in diameter
What shape is the shaft of the radius?
Triangular
What does the shaft of the radius have?
Three borders and three surfaces
What is in the middle of the lateral surface of the radial shaft?
A small roughening for the attachment of the pronator teres muscle
What happens to the radius in the distal region?
It expands to form a rectangular end
What happens to the lateral side of the distal region of the radius?
It projects distally as the styloid process
What is in the medial surface of the distal region of the radius?
A concavity called the ulnar notch
What does the ulnar notch do?
Articulates with the head of the ulna
