Spinal cord lesions at T1 level:
Root lesions eg T1 compression by a disc lesion
Brachial plexus lesions:
Peripheral nerve lesions:
Myopathy:
Trophic disorders:
Note that in discriminating an ulnar nerve lesion from a T1 root lesion remember that in a T1 root lesion there is no sensory loss that affects the hand.
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