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Spinal origin variation of medial pectoral nerve. Anatomic variation of lateral and medial pectoral nerves. The MPN was formed by C8 and T1 (a) in 73.3% of cases, by C8 (b) in 23.4% of cases, and by T1 (c) in 3.3% of cases. Arrows denote each spinal nerve participating in the MPN. Reprinted from Lee [10]
