[Effects of NPY microionophoresis on the units in nucleus tractus solitarius (NTS) responsive to baro- and chemoreceptor].

This experiment is designed to study the effects of NPY microionophoresis on the units in NTS responsive to baro- and chemoreceptor activiation at cellular level. In the experiment, it examined 62 units with spontaneous discharge in NTS. Among them, 34 were excited and 19 were inhibited by NPY microionophoresis. And other 9 units failed to respond to NPY microionophoresis. The units with the increase and decrease of discharge frequency to the activation of carotid baroreceptor showed excitation (16/21) and inhibition (7/11) respectively in response to NPY microionophoresis. The units with the increase (8/14) and decrease (5/9) of discharge frequency to the activation of carotid chemoreceptor mainly showed excitation.