Ulna Health Dictionary

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Ulna: From 3 Different Sources

The longer of the 2 bones of the forearm; the other is the radius. With the arms straight at the sides, palm forwards, the ulna is the inner bone (that is, nearer the trunk) running down the forearm on the side of the little finger.The upper end of the ulna articulates with the radius and extends into a rounded projection (known as the olecranon process) that fits around the lower end of the humerus to form part of the elbow joint.

The lower end of the ulna articulates with the carpals (wrist bones) and lower part of the radius.

Health Source: BMA Medical Dictionary
Author: The British Medical Association
The inner of the two bones in the forearm. It is wide at its upper end, and its olecranon process forms the point of the elbow. In its lower part it is more fragile and liable to be broken by a fall upon the forearm while something is grasped in the hand. Chipping-o? of the olecranon process is a not uncommon result of falls upon the elbow. (See BONE, DISORDERS OF – Bone fractures.)
Health Source: Medical Dictionary
Author: Health Dictionary
n. the inner and longer bone of the forearm (see illustration). It articulates with the humerus and radius above and with the radius and indirectly with the wrist bones below. At its upper end is the *olecranon process and *coronoid process; at the lower end is a cone-shaped styloid process. —ulnar adj.
Health Source: Oxford | Concise Colour Medical Dictionary
Author: Jonathan Law, Elizabeth Martin

Ulnar Nerve

A major NERVE in the arm, it runs from the brachial plexus to the hand. The nerve controls the muscles that move the ?ngers and thumb and conveys sensation from the ?fth and part of the fourth and from the adjacent palm. Muscle weakness and numbness in the areas supplied by the nerve is usually caused by pressure from an abnormal outgrowth from the epicondyle at the bottom of the humerus (upper-arm bone).... ulnar nerve

Ulna, Fracture Of

A fracture of the ulna, 1 of the 2 bones of the forearm. Ulnar fractures typically occur across the shaft or at the olecranon process.

A fracture to the shaft usually results from a blow to the forearm or a fall onto the hand. Sometimes the radius is fractured at the same time (see radius, fracture of). Surgery is usually needed to reposition the broken bone ends and fix them together using either a plate and screws or a long nail down the centre of the bone. The arm is immobilized in a cast, with the elbow at a rightangle, until the fracture heals.

A fracture of the olecranon process is usually the result of a fall onto the elbow. If the bone ends are not displaced, the arm is immobilized in a cast that holds the elbow at a rightangle. If the bone ends are displaced, however, they are fitted together and fixed with a metal screw.... ulna, fracture of

Ulnar Artery

a branch of the brachial artery arising at the elbow and running deep within the muscles of the medial side of the forearm. It passes into the palm of the hand, where it unites with the arch of the radial artery and gives off branches to the hand and fingers.... ulnar artery

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