在麻醉、切断双侧颈迷走神经、制动、人工通气下，对猫、家兔和大鼠进行实验。在颈２、３之间半横贯切割脊髓后，双侧膈神经节律性放电活动均存在；继而在颈３～５之间正中矢状切割脊髓后，半横贯对侧的膈神经放电依然存在，而同侧的完全消失。半横贯脊髓后，双侧膈神经放电幅度均降低，以同侧为甚。这些结果提示：延脊吸气神经元与膈神经核在脊髓平面存在着交叉联系，即一侧膈神经核接受来自双侧脊髓下行的吸气性驱动，以同侧为主。 Experiments were performed on cats, rabbits and rats under anesthesia, bilateral vagus nerve block, brakes, and artificial ventilation. In the cervical 2,3 between the half transverse cut spinal cord after bilateral rhythmic ventricular phrenic discharge activity exist; then in the neck between the median sagittal sinus spinal cord 3-5, the transversal semi-transverse phrenic nerve discharge still exists, The ipsilateral disappear completely. Half traverse the spinal cord, bilateral phrenic nerve discharge amplitude are reduced to the ipsilateral staggering. These results suggest that there is a cross-sectional relationship between the inspiratory neurons of the extension ridge and the phrenic nerve nucleus in the spinal cord plane, ie, the phrenic nerve nucleus on one side receives inhalation drive from the descending bilateral spinal cord, dominated by the ipsilateral.