THE SIMULTANEOUS DISCHARGES OF TWO NEURONS IN N. Pf AND RF AND THE INFLUENCES ON THEM BY STIMULATING CENTRAL GRAY MATTER

This paper employs the method of simultaneous recording of the electric discharges oftwo neurons with two microelectrodes to study the interrelationship of simultancous electricactivities of pain excitation neurons (PEN) and pain inhibition neurons (PIN) in N. parafas-cicularis (Pf) of thalamus and reticular formation (RF) of midbrain in 42 rats. The resultsprove: (i) There are both PEN and PIN in RF in midbrain and they act coordinately;(ii) noxious messages may simultaneously act on PEN and PIN in N. Pf and RF, and thereciprocal coordination of electric activities of these two kinds of neurons is very obvious;(iii) stimulating central gray matter or injecting morphine may weaken the activities ofPEN simultaneously, with the opposite effects on PIN.