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A rare variation in the formation of the upper trunk of the brachial plexus - a case report

Author(s): Nayak S | Somayaji N | Vollala VR | Raghunathan D | Rodrigues V | Samuel VP | Alathady Malloor P

Journal: Neuroanatomy
ISSN 1303-1783

Volume: 4;
Issue: 1;
Start page: 37;
Date: 2005;
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Keywords: brachial plexus | upper trunk | variation | Erb’s point | spinal nerve

Brachial plexus is the plexus of nerves that supplies the upper limb. Variations in the origin and distribution of the branches of brachial plexus are common but variation in the roots and trunks are very rare. Here, we report one of such rare variations in the formation of the upper trunk of the brachial plexus. In this case, the upper trunk was formed by the union of ventral rami of C5, C6 and C7 nerves. The middle trunk was absent and lower trunk was normal.
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