45 Flashcards
What articulates at the distal radio-ulnar joint?
The rounded head of the ulna articulates with the ulnar notch on the medial side of the distal end of the radius.
What is the main uniting structure of the distal radio-ulnar joint?
A fibrocartilaginous triangular articular disc, sometimes called the “triangular ligament,” binds the ends of the ulna and radius together.
How does the joint cavity of the distal radio-ulnar joint appear in coronal section?
The joint cavity is L-shaped, with the vertical bar between the radius and ulna, and the horizontal bar between the ulna and the articular disc.
What forms the fibrous layer of the joint capsule of the distal radio-ulnar joint?
The fibrous layer encloses the joint but is deficient superiorly.
What is the function of the sacciform recess in the distal radio-ulnar joint?
The sacciform recess accommodates the twisting of the capsule during pronation and supination.
