Does the radius articulate at the elbow joint?
Elbow. The radius articulates with the ulna in a synovial pivot joint. The radial head rotates within the annular ligament and radial notch on the ulna to produce pronation of the forearm. The radius and ulna also articulate distally in reverse to their articulation at the elbow to produce supination.
What does the distal radius articulate with?
The wrist is the common term used to describe the multiple articulations that exist between the distal radius, ulna, and eight carpal bones (Fig. 25-2). The distal radius articulates with the scaphoid and lunate; and this is called the radiocarpal joint.
What articulates to form the elbow?
The elbow is a complex joint formed by the articulation of three bones –the humerus, radius and ulna.
What connects the radius to the ulna at the elbow?
Tendons are soft tissue that connects muscles to bones to provide support. This tendon attaches the biceps muscle on the front of the arm to the radius allowing supination, rotation of the elbow. This tendon attaches the triceps muscle on the back of the arm to the ulna bone allowing the elbow to straighten.
How does the radius and ulna attach to and rotate around the humerus when the elbow flexes?
The radial and ulnar collateral ligaments connect and maintain the position of the radius and ulna relative to the epicondyles of the humerus. The annular ligament of the elbow extends from the ulna around the head of the radius to hold the bones of the lower arm together.
What is the function of radius and ulna?
The radius and ulna pivot around one another to allow rotation of the wrist. Together, along with the humerus, they create the elbow joint. The radius is often thought of as the larger of the two long bones in the forearm because it is thicker than the ulna at the wrist, but it is thinner at the elbow.
How do you remember capitulum and Trochlea?
The mnemonic of the order of appearance of the individual ossification centers is C-R-I-T-O-E: Capitellum, Radial head, Internal (medial) epicondyle, Trochlea, Olecranon, External (lateral) epicondyle.
Where do the radius and ulna articulate?
The radius articulates proximally at the elbow with the capitulum of the humerus and the radial notch of the ulna. It articulates at its distal end with the ulna at the ulnar notch and with the articular surfaces of the scaphoid and lunate carpal bones.
What articulates with the ulna?
The ulna articulates with the humerus at its most proximal point forming the elbow in a hinge joint. It is the trochlea of the humerus which sits in the semi-lunar notch of the ulna to form this joint.
How does elbow articulate?
The first 2 are the ones traditionally thought of as constituting the elbow: the humeroulnar articulation (the synovial hinge joint with articulation between the trochlea of the humeral condyle and the trochlear notch of the ulna) and the humeroradial articulation (the articulation between the capitulum of the humeral …
Is the capitellum on the outside of the elbow?
The capitellum on the outside of the elbow. is the capitulum medial or lateral? The other, called the capitulum, is a small spherical structure lateral to the trochlea that articulates with the head of the radius. The capitulum is on the lateral side, the trochlea is medial.
Where is the radial head of the elbow?
The radial head articulates with the capitellum of the distal humerus and the ulna (proximal radial ulnar joint). The radial head is a secondary stabilizer of the elbow joint along with the radial and lateral ulnar collateral ligaments and the annular ligament.4 The radial head is on the lateral aspect of the proximal forearm/elbow region.
How does the capitulum articulate with the radius?
The capitulum laterally articulates with the radius; the trochlea, a spool-shaped surface, articulates with the ulna. is the capitulum a condyle? A large central condyle which has two articular components – the capitulum which articulates with the head of the radius, and the trochlea which articulates with the ulna.
What is the articulation between the ulna and radial head?
The proximal radioulnar joint is the articulation between the radial head and the radial notch (lesser sigmoid notch) of the ulna. The radioulnar joint allows for rotation of the radial head. This joint is rarely the cause of elbow symptoms in throwers.