Elbow Joints Flashcards
Why are there humero-ulnar and humero-radial articulations?
The trochlea and capitulum of the humerus articulate with the trochlear notch of the ulna and slightly concave superior aspect of the head of the radius.
What type of joint is the elbow joint?
Hinge type of synovial joint, located 3 cm inferior to humeral epicondyles
Where is the radial collateral ligament?
extends from the lateral epicondyle of the humerus and blends distally with the anular ligament of the radius.
Anular ligament of the radius
encircles and holds the head of the radius in the radial notch of the ulna forming the proximal radio-ulnar joint and permitting pronation and supination of the forearm.
Ulnar collateral ligament
extends from the medial epicondyle of the humerus to the coronoid process and olecranon of the ulna.
Consists of three bands
What are the three bands of the ulnar collateral ligament?
Anterior cord-like band- the strongest band
Posterior fan-like band- is the weakest
Oblique band- deepens socket for the trochlea of the humerus
The annular ligament
attaches to the ulna, anterior and posterior to the radial notch, which forms a collar that, with the radial notch, forms a ring that completely encircles the head of the radius.
Distal-radio-ulnar joint
a pivot type synovial joint. The radius moves around the relatively fixed distal end.
Articulates with the ulnar notch on the medial side of the distal end of the radius.
Ligaments of the distal-radio ulnar joint
Anterior and posterior ligaments strength the joint capsule