Ulnar nerve - Definition

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The ulnar nerve runs from the armpit to the wrist, where is splits into several smaller nerves that continue to the tips of certain fingers. The ulnar nerve plays an important role in the sense of touch of part of the hand and the 5th and 4th fingers, including a part of the 3rd, yet its primary function is to ensure finger movement. If this nerve is damaged by pressure, or a lesion caused by fractures, especially those of the upper section of the humerus or inner section of the elbow, the consequences can include mobility and sense impairment of the affected areas.