What is the function of the 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.
What is the movement of the radius and ulna?
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 movement does the radius and ulna allow the hand to perform?
These pivot joints allow the radius to rotate around the ulna, which turns the palm of the hand (pronation and supination).
How does the ulna work?
The ulna articulates with the radius proximally and distally to produce pronation (from the proximal joint) and supination (from the distal joint) of the forearm. The ulna also articulates with the radius in a syndesmosis joint via its interosseous membrane.
What is the main function of the radius?
Function: The radius permits the forearm and hand to pronate and supinate, flex and extend at the elbow, and adduct, abduct, extend, flex, and circumduct the wrist.
What is the function of the radius?
Does the ulna move?
Movement of the ulna is essential to such everyday functions as throwing a ball and driving a car. The ulna extends through the forearm from the elbow to the wrist, narrowing significantly towards its distal end.
What movement does the ulna perform?
The main function of the ulna, along with the radius, is to assist with rotation. This rotation allows for the maximal function of the wrist and hand due to the increased range of motion. The sole motion of the elbow joint is flexion and extension, otherwise known as bending and straightening the arm.
How do you remember the radius and ulna?
The radius connects to the thumb side of your wrist and is the larger of the two while the ulna connects to the pinky side and is the smaller one. An easy way to remember the difference between the two is the word radius is longer than the word ulna just like the bones themselves.
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 is the relationship between the radius and ulna?
The radius bone ( os radius) supports the lateral (thumb) side of the forearm and the ulna bone ( os ulna) supports the medial (little finger) side. At the elbow, the radius and ulna articulate with the trochlea and capitulum of the humerus bone. Learn the radius and ulna faster with these intelligent quizzes and free fill-in-the-blank diagrams.
What are the radius and ulna bones of the forearm?
Try this. The radius and ulna are the bones of the forearm. The forearm is the region of the upper limb that extends from the elbow to the wrist. The radius bone ( os radius) supports the lateral (thumb) side of the forearm and the ulna bone ( os ulna) supports the medial (little finger) side.
What does the ulna do?
The ulna is one of two bones that give structure to the forearm. The ulna is located on the opposite side of the forearm from the thumb. It joins with the humerus on its larger end to make the elbow joint, and joins with the carpal bones of the hand at its smaller end. Together with the radius, the ulna enables the wrist joint to rotate.
What is the ulnar notch of the radius?
The ulnar notch of the radius is a medial concavity upon the distal head of the bone which directly contacts the distal ulna at the same level. The ulna is a long bone that helps stabilize the antebrachial region from the medial side of the forearm. Its proximal end consists of the following processes (2) and notches (2):