sternocostal head of pectoralis major (muscle)

(redirected from pars sternocostalis musculi pectoralis majoris)

ster·no·cos·tal head of pec·to·ra·lis ma·jor (muscle)

portion of pectoralis major (muscle) originating from the sternum and ribs; acting alone the ternocostal part extends the arm at the shoulder joint; acting with the clavicular head it adducts the arm. See: pectoralis major (muscle).
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