切断兔颈部迷走神经后,一般都可以引起全身血压的升高及呼吸运动的改变。因为兔颈部迷走神经除含有支配心脏及其他脏器的传出纤维外,尚含有来自胸腔及腹腔脏器的传入纤维。特别是现已证明:沿心肺迷走传入纤维进入中枢的冲动,对血管运动中枢及肾上腺素的释放等具有紧张性的抑制作用,并参与循环的生理调节。因此,对切断兔颈部迷走神经所引起的血压升高,究竟主要是由于解除了迷走传出纤维对心脏的抑制作用,抑或主要是由于阻断了迷走传入冲动对血管运动中枢的影响等问题,我们进行了一些实验分析,在实验中还观 Cut off the rabbit vagus nerve, the general can cause systemic blood pressure and respiratory changes. Because the rabbit vagus nerve in addition to containing the heart and other organs of the outgoing fibers, but also from the chest and abdominal organs of the incoming fibers. In particular, it has been demonstrated that the impulses that are introduced into the central axis along the cardiac and pulmonary vasoconstrictors have a tonic inhibitory effect on the release of vasomotor centers and epinephrine and are involved in the physiological regulation of the circulation. Therefore, the cut off of the vagus nerve in rabbits caused by elevated blood pressure, after all, mainly due to the lifting of the vagus fiber out of the heart inhibition, or mainly due to block the vagus afferent impulse on the vascular center and other issues , We conducted some experimental analysis, but also in the experiment