Ulnar nerve palsy
From WikiLectures
The most common cause of ulnar nerve palsy is its damage. It occurs in several typical places.
Damage Locations[edit | edit source]
Nervus ulnaris passes through several straits.
- In the place of the septum intermusculare brachii mediale, where it enters from the sulcus bicipitalis medialis.
- Behind the medial epicondyle of the humerus it passes in the sulcus nervi ulnaris.
- In canalis cubitalis – canal between the olecranon and the beginning of the m. flexor carpi ulnaris.
- In the ulnar tunnel (Guyon canal on the hand).
- Injuries to the ulnar nerve most often occur with a cut on the volar side of the wrist, where the nerve is located superficially.
Image of polio[edit | edit source]
- Inability to flex II.-V. of the finger in the metacarpophalangeal joints (mm. interossei).
- Inability to adduct and abduct II.–V. finger (mm. interossei).
- Inability to flex in the distal interphalangeal joint IV. and V. finger (m. flexor digitorum profundus).
- Severe adduction of the thumb - a novel symptom.
- Claw-like hand – metacarpophalangeal joints extended (predominance of extensors), interphalangeal joints in flexion (predominance of flexors), thumb abducted.
- Sensitivity disorders in the innervation area.
Causes of paralysis[edit | edit source]
- Syndrome cubital tunnel - chronic microtraumatization during exertion in the elbow.
- Compression in Guyon's canal - mainly motor disability, hypothenar is usually spared; atrophy of the 1st interosseus dominates.
- Chronic compressive syndromes - rheumatological diseases, arthritic disfigurements, external compression when leaning on a mat (eg: glass grinders).
- Axillary lesion - very rare (eg: compression with high crutches).
- Trauma - fractures in the elbow area (eg: dislocations and displaced fractures), cuts in the wrist area.
- Soft tissue tumors - lipoma, fibroma.
Links[edit | edit source]
Related Articles[edit | edit source]
- Ulnar nerve
- Examination of the ulnar nerve
- Peripheral nerve involvement syndromes
- Canalis cubitalis
- Humerus
- Guyon Channel
- Cubital landscape
- Mm. interossei manus
- Upper Extremity Bones
Source[edit | edit source]
- PASTOR, Jan. Langenbeck's medical web page [online]. [cit. 2009]. <https://langenbeck.webs.com/>.
References[edit | edit source]
- AMBLER, Zdeněk – BEDNAŘÍK, Josef. Klinická neurologie : část speciální. II. 1. edition. Triton, 2010. ISBN 978-80-7387-389-9.
