MEDLINEplus Health Information: Return to home page   A service of the National Library of Medicine: Go to NLM home page
Search     Advanced Search    Site Map    About MEDLINEplus    Home
Health Topics: conditions, diseases and wellness Drug Information: generic and brand name drugs Dictionaries: spellings and definitions of medical terms Directories: doctors, dentists and hospitals Other Resources: organizations, libraries, publications, MEDLINE

Medical Encyclopedia

Disease     Injury     Nutrition     Poison     Special     Surgery     Symptoms     Tests

Ulnar nerve damage
 
Overview   Symptoms   Treatment   Prevention   

Ulnar nerve dysfunction

Alternative names:

neuropathy - ulnar nerve

Definition:

A condition involving impaired movement or sensation in the wrist and hand caused by damage to the Ulnar nerve

Causes, incidence, and risk factors:

Ulnar nerve dysfunction is a form of peripheral neuropathy. It occurs when there is damage to the ulnar nerve, which travels down the arm and supplies flexion to the wrist, and aids in movement and sensation of the wrist and hand. Ulnar nerve dysfunction is a common form of peripheral neuropathy.

Dysfunction of a single nerve group, such as the ulnar nerve, is classed as mononeuropathy. Mononeuropathy implies a local cause of the nerve damage, although systemic disorders may occasionally cause isolated nerve damage (such as occurs with mononeuritis multiplex). The usual causes are direct trauma, prolonged external pressure on the nerve, and compression of the nerve from nearby body structures. Entrapment involves pressure on the nerve where it passes through a narrow structure. The damage involves destruction of the myelin sheath of the nerve, or destruction of part of the nerve cell (the axon). This damage slows or prevents conduction of impulses through the nerve.

The ulnar nerve is commonly injured at the elbow because of elbow fracture or dislocation. The ulnar nerve is near the surface of the body where it crosses the elbow, so prolonged pressure on the elbow or entrapment of the nerve may cause damage. Prolonged pressure on the base of the palm may also cause damage to part of the Ulnar nerve, resulting in symptoms that are localized to the small hand muscles. In some cases, no detectable cause can be identified. The mechanical factors may be complicated by ischemia (lack of oxygen related to decreased blood flow) in the area.


Adam

The information provided herein should not be used for diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Copyright 2000 adam.com, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Health Topics | Drug Information | Dictionaries | Directories | Other Resources