Common
|
Median | Carpal tunnel | Entrapment, diabetes, hypothyroidism, connective tissue disease | Abductor pollicis brevis, opponens pollicis | Thumb, index and middle finger | C6 or C7 radiculopathy; local pathologies |
Ulnar | Elbow (cubital tunnel) | External compression, trauma (recent or distant) | Long flexors of little and ring fingers, finger abductors and adductors and lumbricals | Little and ring fingers | More distal or proximal ulnar lesion; motor neurone disease; T1 lesions |
Uncommon
|
Radial | Upper arm | External compression, trauma | Finger and wrist extensors, some weakness of brachioradialis | Anatomical snuffbox | C7 radiculopathy |
Axillary | Humeral head | Trauma, humeral head | Deltoid | Lateral shoulder | |
Ulnar | Wrist (Guyon’s canal) or hand | Compression (cycling), entrapment | Wrist: adductor pollicis, interosseous muscles and hypothenar muscles Hand: adductor pollicis, interosseous muscles | Wrist: little and half ring finger Lesions in the hand: none | Motor neurone disease, Syringomyelia, T1 radiculopathy |
Long thoracic | Not clear | Usually unknown; trauma | Serratus anterior; winging of scapular | None | Neuralgic amyotrophy |
Rare
|
Anterior interosseous branch of median nerve | Just below the elbow | Fibrous bands, trauma | Flexor pollicis longus, flexor digitorum profundus of index finger (loss of pinch sign), pronator quadratus | | |
Posterior interosseous branch of radial nerve | As nerve enters supinator muscle | Entrapment, trauma | Finger extensors: finger drop without wrist drop | None | C7 radiculopathy, upper motor neurone lesions, neuralgic amyotrophy |
Suprascapular | Suprascapular notch | Trauma, lifting (rucksack) | Supraspinatus and infraspinatus | None | Shoulder pathology, neuralgic amyotrophy |
Musculocutaneous | | Trauma, iatrogenic | Biceps | Lateral forearm | C6 radiculopathy |