Raphé-produced excitation of spinal cord motoneurons in the cat.
In all motoneurons examined, both flexor and extensor, raphé (pallidus) stimulation consistently produced an excitatory postsynaptic potential (EPSP). Upon interaction with a group Ia EPSP there was summation resulting in neuronal discharge. The raphé-induced EPSP also facilitated the initial segment-somadendritic coupling and hence the motoneuron excitability. These data support an excitatory role for raphé-spinal fibers on cat hindlimb motoneurons.
Fung
S J
SJ
Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, Pullman 99164-6520.
Barnes
C D
CD
D000200:Action Potentials; D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D004566:Electrodes; D004594:Electrophysiology; D009046:Motor Neurons / Q000502:physiology*; D011903:Raphe Nuclei / Q000502:physiology*; D013116:Spinal Cord / Q000502:physiology*; D009435:Synaptic Transmission