You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Median nerve injury at wrist, is commonly tested by: and explain in detail?
Injury or compression of median nerve at wrist (eg carpel tunnel syndrome) can be tested by 1. Pen test for loss of action of Abductor pollicis brevis 2. Ape thumb deformity Q (adducted posture of thumb) 3. Loss of opposition & abduction of thumb Q (d/ t wasting of thenar muscles) 4. Sensory loss - lateral 31/2 of digits & 2/3 palm (autonomous zone is tip of index & tniddle finger) Abductor pollicis longus is supplied by posterior interosseous nerve (br. of radial nerve)Q; so abduction of thumb is not completely lost.