[The convergence of influences from the locomotor points of the midbrain and medulla oblongata and from the inhibitory point of the pons onto the bulbar neurons].
Synaptic responses of medial and lateral medullary neurons to repetitive stimulation of locomotor points (LPs) of the midbrain and medulla and of an inhibitory pontine point were recorded in mesencephalic decerebellate cats. Excitatory postsynaptic potentials (PSPs) and discharges were observed usually in medial neurons as well as mixed PSPs when an inhibitory point was stimulated. Almost a half of lateral neurons and more than a quarter of medial ones changed the frequency of the background discharge giving no responses time-locked to stimuli. Medial neurons with responses time-locked to stimuli were equally susceptible to stimuli delivered to midbrain and medullary LPs and almost as often to stimuli applied to the inhibitory point. Medial neurons with responses time-unlocked to stimuli and lateral neurons were mostly susceptible to the input from the medullary LP, less affected by stimulation of the midbrain LP and responded rarely to stimulation of the inhibitory point. Convergence of influences from the midbrain and medullary LPs was the same onto neurons of all populations. Role of different neuronal populations for initiation and cessation of locomotion is discussed.
Selionov
V A
VA
Shik
M L
ML
D000818:Animals; D001931:Brain Mapping; D002415:Cats; D003655:Decerebrate State / Q000503:physiopathology; D004558:Electric Stimulation; D008124:Locomotion / Q000502:physiology*; D008526:Medulla Oblongata / Q000502:physiology*; D008636:Mesencephalon / Q000502:physiology*; D008839:Microelectrodes; D009433:Neural Inhibition / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D011149:Pons / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013238:Stereotaxic Techniques; D013569:Synapses / Q000502:physiology
Konvergentsiia vliianiĭ iz lokomotornykh tochek srednego i prodolgovatogo mozga i tormoznoĭ tochki mosta na bul'barnykh neĭronakh.