Ulna

Ulna: The larger of the two long bones within the forearm. (The smaller one is the radius). The ulna is on the same side of the arm as the little finger.
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The presence of the ulna in Type 2 cases is usually sufficient enough that the elbow is functional and stable. There may be some degree of deformity in the fingers or thumb.
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The trochlea of the humerus, which joins with the olecranon of the ulna, and actually sets the limits on flexion; the bending movement that can decrease the angle between the bones of the elbow - and extension; ...
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It involves the upper arm bone (humerus), two lower arm bones (radius and ulna) and supporting ligaments.
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FLEXOR DIGITORUM SUPERFICIALIS - ORIGIN: Medial epicondyle & Medial coronoid process of ulna & Oblique line, radius INSERTION: Sides of second phalanx of 4 fingers ACTION: Flexes first and second phalanges, flexes hand, and flexes forearm ...
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the radius (on the thumb side of your arm)
the ulna (on the little-finger side of your arm).
How does it occur?
A forearm fracture usually occurs from: ...
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The orthopedic surgeon then drills out a portion of the center of the humerus and ulna and inserts one stem of the prosthesis into each bone. Usually, bone cement is used to hold the stems in place.
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This is called the upper arm, or, simply, the arm. At the elbow, the humerus connects with 2 bones: the radius and the ulna. These bones go from the elbow to the wrist and are regarded as the forearm.
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