Abstract:
:Motor axons supplying lumbrical muscles are less severely affected than axons supplying thenar muscles in the carpal tunnel syndrome; sometimes lumbrical motor fibers are less affected than digit 2 sensory fibers. This pattern is consistent with compression of both the anterior and posterior aspects of the median nerve in the carpal tunnel because nerve fibers responsible for thenar, lumbrical, and digit 2 functions lie in an anterior-posterior gradient within the distal median nerve. Recognition of lumbrical sparing supports the electrodiagnosis of carpal tunnel syndrome when the distal latency to thenar muscles or the palm-to-wrist mixed median nerve conduction velocity is normal.
journal_name
Neurologyjournal_title
Neurologyauthors
Logigian EL,Busis NA,Berger AR,Bruyninckx F,Khalil N,Shahani BT,Young RRdoi
10.1212/wnl.37.9.1499subject
Has Abstractpub_date
1987-09-01 00:00:00pages
1499-505issue
9eissn
0028-3878issn
1526-632Xjournal_volume
37pub_type
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