The anatomy of the supraclavicular nerve during surgical approach to the clavicular shaft CORR Open Access

Description: Conclusions There were two or three branches of the supraclavicular nerve crossing the clavicle 97% of the time and a wide variability of the location of these branches outside the safe zones.
Clinical Relevance There are safe zones within 2.7 cm of the sternoclavicular joint and 1.9 cm of the acromioclavicular joint. Between these safe zones, the location of the nerve branches is variable and the surgeon must use meticulous dissection if he or she wishes to prevent transection.
The anatomy of the supraclavicular nerve during surgical approach to the clavicular shaft. Nathe T, Tseng S, Yoo B. Clin Orthop Relat Res. 2011 Mar;469(3):890-4 (full text)