AI Article Synopsis
- Axons from the median and ulnar nerves can connect through unusual pathways, potentially creating alternate routes for nerve fibers to reach the hand.
- A study on 90 cadaveric upper limbs found that 91% exhibited one to five variations in these connections, with several statistically significant associations identified.
- These variations may explain some uncommon clinical issues related to median and ulnar nerve conduction, which seem to contradict established anatomical understanding.
Article Abstract
Axons from the median and ulnar nerves can pass to each other through aberrant connections between them. Multiple interconnections between the nerves may provide a detour route for nerve fibres going to the hand. We investigated the incidence of variations and the associations between them in 90 cadaveric upper limbs. In 91% of upper limbs, one to five variations were found, with several statistically significant associations. The contribution of the C8 nerve to the lateral cord was positively associated with an accessory contribution of the lateral cord to the ulnar nerve. The latter variation showed positive association with the occurrence of any of the variations in the hand itself. Ulnar innervation of the superficial head of the flexor pollicis brevis was positively associated with the Riche-Cannieu communication. The co-existence of the variations and their associations may be the explanation for unusual clinical findings related to median and ulnar conduction, which appear contrary to anatomical knowledge.
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| http://dx.doi.org/10.1177/1753193415622760 | DOI Listing |
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