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To provide anatomic data for reconstructing thumb opposition function by transplanting partial pectoralis minor taking along lateral thoracic skin flap.On 20 sides of 10 adult cadaveric thoracic specimens, the incidence, bilateral variations of cutaneous and muscular branches of pectoralis minor originated from lateral thoracic artery were investigated.Cutaneous and muscular branches of lateral thoracic artery were sent out permanently (with the incidence of 80%) to supply lateral thoracic skin and pectoralis minor.