Topic summary
Thenar muscles
Extracted from the Wikipedia article Thenar eminence.
Nerve supply
There are normal variations. In a Cannieu-Riche anastomosis, fibers from the deep branch of ulnar nerve innervate the opponens pollicis and/or abductor pollicis brevis. Regardless of their final innervation, the nerves that reach the thenar muscles arise from the C8 and T1 roots, pass through the lower trunk of the brachial plexus, and then through the medial cord of the plexus.