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The brachial plexus is formed by the cervical nerve roots emerging from c-5 to t-1 with some individuals having contributions from c-4 (prefixed) and some from t-2 (post fixed). These nerve roots then form a bundle as they emerge from the spine and then pass behind the clavicle and into the upper arm becoming the nerves of the upper limb. Anatomically the plexus assumes typical patterns of which there are minor variation but which conceptually help when confronted with the damaged anatomy either from an open or closed injury. In particular a knowledge of the usual location of specific motor branches can help specify the anatomic location of injury helping to reveal prognosis and plan suitable therapeutic intervention.