Causes and mechanisms of development
Damage to n. ulnaris develops as a result of external compression of the nerve trunk or its anatomical displacement. The primary site of the pathological process is the elbow region. This condition is among the local lesions of the peripheral nervous system and leads to the formation of peripheral paresis in the nerve's innervation zone.
Clinical presentation
The main morphological and clinical manifestation of n. ulnaris lesion is local hypotrophy or hand muscle atrophy.
Main features of peripheral paresis in this pathology:
- Specific decrease in muscle mass within the innervation zone.
- Impairment of motor activity of the hand and fingers.
- Condition assessment is based on a detailed comparison of muscle functions with their innervating peripheral structures.
Diagnostic approach
Diagnostics is based on clinical examination and topical analysis.
- Determining the level of lesion: allows differentiating peripheral nerve pathology from nerve root involvement.
- Topical diagnostics: aims to accurately identify the damaged peripheral nerve.
- Assessment of muscle status: detection of local atrophies characteristic of n. ulnaris involvement.
Elbow under pressure — hand without strength: compression in the elbow region leads to hand muscle atrophy.
Class and exam questions
Where exactly does ulnar nerve compression occur in tunnel syndrome?
Compression or displacement of the nerve occurs in the elbow region.
What is the main clinical sign characteristic of ulnar nerve lesion in the hand?
A specific manifestation is the development of hand muscle atrophy, which is a sign of peripheral paresis.
What is the objective of topical diagnostics in such pareses?
It allows accurate identification of the specific damaged peripheral nerve or nerve root and establishes the level of injury.
What else to study on this topic
- Carpal tunnel syndrome and median nerve lesion
- Differential diagnosis of nerve root and peripheral nerve lesions
- Plexopathies: Duchenne-Erb and Dejerine-Klumpke syndromes
- Neuromuscular junction pathology and myopathic syndrome
- Mixed paresis and amyotrophic lateral sclerosis
- Intercostal nerve mononeuropathy
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