Health & Fitness

What is an ulna bone?

By: Casey DiazUpdated: December 06, 2020

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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.

Then, what is the end of the ulna called?

The ulna extends through the forearm from the elbow to the wrist, narrowing significantly towards its distal end. At its proximal end it forms the elbow joint with the humerus of the upper arm and the radius of the forearm. The ulna extends past the humerus to form the tip of the elbow, known as the olecranon.

What does the ulna bone look like?

Structure. The ulna is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. It is broader close to the elbow, and narrows as it approaches the wrist.

Which is radius and ulna?

Radius and ulna. The radius and the ulna constitute as the bones of the forearm. The antebrachial region, as it is clinically known, spans the length of the region which extends roughly from elbow to wrist. The radius is the lateral of the two bones, which makes the ulna the medial bone of the forearm.

What does a broken ulna feel like?

A broken forearm usually causes immediate pain. Because both bones are usually involved, forearm fractures often cause an obvious deformity — your forearm may appear bent and shorter than your other arm. Inability to rotate arm. Numbness or weakness in the fingers or wrist (rare)

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How long does it take for the ulna bone to heal?

A stable, simple and isolated fracture of the ulna (secondary to a direct blow) can be treated with a cast for about four to six weeks. Your doctor will closely follow your progress with X-rays to assure nondisplacement of the fracture and proper bone healing.

What is the function of the ulna bone?

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.

Why does my ulna hurt?

Pain on this side can be very common. It can result from injury to bones, cartilage, ligaments or tendons. Ulnar Impaction Syndrome (when the ulna is longer than the radius, which can cause it to “bump into” the smaller wrist bones) Inflammation or irritation of the tendons that bend and extend the wrist.

Which is stronger radius or ulna?

The ulna, along with the larger and stronger radius, makes up the forearm. Being longer and thinner, the ulna is often more easily fractured as a result of trauma. The upper end (the head) of the ulna meets with the lower end of the humerus and one side of the radius.

Does a broken ulna require surgery?

Your doctor may recommend surgery if: The bone has broken through the skin—this type of injury (called an open fracture) is at risk for infection and requires specific treatment. The fracture is unstable—the ends of the broken bones will not stay lined up. Bone segments have been displaced.

What is the common name for ulna?

Skeletal System Common Names for Bones
A B
Fibula Small bone in the lower leg
Humerus Bone of the upper arm
Ulna Stationary bone in the forearm
Radius Rotates wrist. In the forearm

What muscles insert on the ulna?

Muscle attachments
Muscle Direction
Brachialis muscle Insertion
Pronator teres muscle Origin
Flexor carpi ulnaris muscle Origin
Flexor digitorum superficialis muscle Origin

How long is the ulna bone?

The following measurements were taken: maximum humeral length (mean: 33.4cm in males; 30.7cm in females), vertical humeral head diameter (mean: 5.0cm in males, 4.4cm in females), humeral epicondylar width (mean: 6.6cm in males; 5.8cm in females), maximum ulnar length (mean: 26.5cm in males, 23.8cm in females), proximal

What happens if you break your radius and ulna?

When the radius and ulna are broken, a number of nearby structures can also be injured. These include the cartilage lining the surfaces of the wrist joint, nerves, blood vessels, ligaments and tendons. Injury to these structures may delay your recovery.

What is a distal ulna fracture?

Fractures of the distal portion of the ulna occur in isolation as a result of a rotational force applied to the wrist or as a result of a direct blow to the ulnar aspect of the distal forearm (nightstick fracture). Isolated ulnar styloid fractures are mostly benign and are treated by nonoperative means.

How do you remember the difference between ulna and radius?

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.

Does the ulna move?

Many muscles in the arm and forearm attach to the ulna to perform movements of the arm, hand and wrist. 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.

How do you know which side of the ulna is?

Ulna – Left/Right
  1. Locate the anterior aspect of Ulna. A good landmark is the trochlear notch.
  2. When viewed anteriorly, the radial notch point to the side the bone is from, i.e. left ulna will have the radial notch (see below) on the left side of the bone.

Does the ulna or radius move?

These pivot joints allow the radius to rotate around the ulna, which turns the palm of the hand (pronation and supination). interosseous membrane spans the distance between the medial edge of the radius and the lateral edge of the ulna.