Brachial Plexus: Structure
Nerve Anatomy
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Overview
From WUSTL NeuromuscularLength: Mean = 15.3 cm Regions Roots Number Usual: 5; C5 to T1 Variants C4 & T2 may contribute axons to plexus No effect on lesion location Most proximal areas of plexus Root branches to brachial plexus: Anterior primary rami Located deep in neck: Between anterior & middle scalene muscles Nerves directly from anterior primary rami Scalene muscles (C5 - C8) Longus coli (C5 - C8) Long thoracic nerve to serratus anterior (C5 - C7) Phrenic nerve, inferior contribution (C5) Dorsal scapular to rhomboids & Levator scapulae (C5) No somatic axons originate from T1 anterior primary rami Most motor axons
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Data sourced from the Washington University Neuromuscular Disease Center. For clinical use, always refer to primary sources.