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How to test palmar cutaneous branch of median nerve

Junnong Tang9/8/21 5:22 PM (CDT)
59 yo female with numbness on the the thenar eminence following a repeat CTS release in 01/2021 (first release surgery was in 2005). Both open release. The numbness pre-op was on the median fingers. NCS (median SNAP with mid palm stim, median CMAP, median-radial thumb comparison) and EMG (including APB, OPPONENS) are normal. Suspecting damage to the palmar cutaneous branch of the median nerve. I do not know how to assess this branch. Help me please. 
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