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Old 09-24-2011
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Default thumb abduction

im confused about the thumb abduction
some say its the median nerve others say its the radial can anyone help with explanation about the thumb movements innervation

thanks in advance
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Old 10-05-2011
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mmmm, thumb abduction is accomplished by two muscles: the abductor pollices longus (APL), and the abductor pollices brevis (APB)...

APL is innervated by posterior interosseous nerve (C7, C8) of RADIAL NERVE
APB is innervated by recurrent branch (C8, T1) of MEDIAN NERVE

So, thumb abduction require two nerves not one....
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Old 10-23-2015
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also something to add-

the APL (Radial n) allows thumb abduction in the plane of the palm
while the APB (Median n.) allows thumb abduction perpendicular to the plane of the palm
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