The effects of electrical stimulation at different rostrocaudal levels of the midbrain, and at sites in the rostral medulla ipsilateral and contralateral to spinal recording sites, were evaluated against the responses of 46 cells belonging to the cat spinomesencephalic tract (SMT). Inhibitory and/or excitatory effects of brain stem stimulation were observed on SMT cells that responded best (26 cells) or exclusively (12 cells) to noxious mechanical or thermal stimuli, as well as on 7 cells responding only to tap and/or stimulation of deep tissues. Recording sites for 32 cells were located in laminae V-VIII (27 cells) and laminae I-III (5 cells). Midbrain stimulation sites were located in the superior colliculus, central gray (CG), red nucleus, and the midbrain reticular formation. Both inhibitory-only and excitatory-only effects were observed, although the most common effect of midbrain stimulation was excitation followed by inhibition (mixed effects). The effects of stimulation at different midbrain levels were determined for each cell. Stimulation in the caudal, middle, or rostral midbrain was often found to exert different effects on the same SMT cell. Stimulation in the rostral medulla at sites located in nucleus raphe magnus (NRM), nucleus reticularis gigantocellularis, and nucleus reticularis magnocellularis produced the same complement of effects observed with midbrain stimulation. Excitation followed by inhibition was the most common effect observed. Stimulus intensities required to produce excitatory or inhibitory effects from midbrain were 114 ± 85 (SD) μA and 210 ± 91 μA, respectively. Stimulus currents required to produce excitatory or inhibitory effects from medullary stimulation sites were 124 ± 56 μA and 70 ± 60 μA, respectively. The mean currents required to produce mixed effects were 221 ± 120 μA (midbrain) and 127 ± 71 μA (medulla). Increasing the stimulus intensity used to evaluate brain stem effects increased the magnitude and duration of effects for 33 cells. Mixed effects were observed on 11 cells at stimulus intensities greater than those required to produce inhibitory-only effects. Significant differences were found between the latencies of excitation and inhibition produced from different brain stem levels. These differences suggest that midbrain and medullary stimulation activate descending pathways with a wide range of conduction velocities and/or supraspinal and spinal connectivities. The spinal trajectory of pathways contributing to the varied effects of brain stem stimulation as well as the complex receptive fields (RFs) of SMT cells were evaluated by the placement of lesions in the cervical spinal cord. Pathways exerting excitatory influences were located primarily, but not exclusively, in the ventral one-half of the spinal cord, whereas those having an inhibitory influence were located in the dorsal spinal cord. It is suggested by the results of this study that the SMT may be involved in the activation of supraspinal pathways involved in the negative as well as positive feedback control of nociceptive neurons in the spinal cord. Furthermore, because of the different results obtained by stimulation at different brain stem levels, it is suggested that the net supraspinal influence on SMT cells may depend on which brain stem level is preferentially activated by stimulus conditions in the periphery. The supraspinal control of SMT cells may be an important response to different intensities of sensory, motor, and visceral stimuli.
