When the central end of the superior laryngeal nerve was stimulated, because the respiratory center was inhibited, the vagal and cardiovascular sympathetic centers were released from the inhibitory effects of the respiratory center. 刺激喉上神经向中端时,由于呼吸中枢被抑制,心迷走中枢及心血管交感中枢就被从呼吸中枢的抑制性影响下释放出来;