Right
- arise from right vagus trunk as crosses first part of subclavian
- hooks around subclavian artery
- ascends between trachea and oesophagus
- passes deep below lobe of thyroid
- close relationship to inferior thyroid artery
- passes beneath lower border of inferior constrictor muscle
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Left
- arises from left vagus trunk as nerve crosses arch of aorta
- hooks around ligamentum venosum
- ascends in groove between trachea and oesophagus (on left side)
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