The main pulmonary arteries are derived from the sixth aortic arch during intrauterine development.
肺主动脉是在胎儿时期时由第六对主动脉弓衍生而来。
2
Result: Ultrasonic indirect sign of left larynx return nerve constricted must be depend on sign of left pulmonary constricted by lymph node mass from below aortic arch 3 cases;