Summary
As part of our studies of the spinal circuitry of the tonic neck reflex, we have recorded extracellularly from Ia reciprocal inhibitory neurons of the decerebrate, labyrinthectomized cat. The activity of a majority of neurons driven by stimulation of the quadriceps nerve was modulated by sinusoidal rotation of the neck; such modulation was much less frequent in the case of neurons driven by stimulation of nerves to more distal muscles. The results suggest that some of the inhibition which is part of the tonic neck reflex is mediated by Ia reciprocal inhibitory neurons, but that other pathways must also play an important role.
Similar content being viewed by others
References
Baldissera F, Hultborn H, Illert M (1981) Integration in spinal neuronal systems. In: Brooks VB (eds) Handbook of physiology, Sect 1. The nervous system, Vol 2. Williams and Wilkins, Baltimore, pp 509–595
Brink EE, Suzuki S, Timerick SJB, Wilson VJ (1985) Tonic neck reflex of the decerebrate cat: a role for propriospinal neurons. J Neurophysiol 54:978–987
Bruggencate G ten, Lundberg A (1974) Facilitatory interaction in transmission to motoneurones from vestibulospinal fibres and contralateral primary afferents. Exp Brain Res 19:248–270
Cavallari P, Edgley SA, Jankowska E (1987) Post-synaptic actions of midlumbar interneurons on motoneurones of hindlimb muscles in the cat. J Physiol 389:675–689
Conway BA, Rosenberg JR (1984) The participation of forelimb flexors in labyrinth and neck reflexes in the decerebrate cat. Brain Res 322:148–151
Jankowska E, Lindström S (1972) Morphology of interneurones mediating Ia reciprocal inhibition of motoneurones in the spinal cord of the cat. J Physiol 226:805–824
Jankowska E, Lundberg A, Rudomin P, Sykova E (1977) Effects of 4-aminopyridine on transmission of excitatory and inhibitory synapses in the spinal cord. Brain Res 136:387–392
Lindsay KW, Roberts TDM, Rosenberg JR (1976) Asymmetric tonic labyrinth reflexes and their interaction with neck reflexes in the decerebrate cat. J Physiol 261:583–601
Lindström S, Schomburg ED (1973) Recurrent inhibition from motor axon collaterals of ventral spinocerebellar tract neurones. Acta Physiol Scand 88:505–515
Manzoni D, Pompeiano O, Srivastava UC, Stampacchia G (1983) Responses of forelimb extensors to sinusoidal stimulation of macular labyrinth and neck receptors. Arch Ital Biol 121:205–214
Schor RH, Miller AD, Tomko DL (1984) Responses to head tilt in cat central vestibular neurons. I. Direction of maximum sensitivity. J Neurophysiol 51:136–146
Suzuki I, Timerick SJB, Wilson VJ (1985) Body position with respect to the head or body position in space is coded by lumbar interneurons. J Neurophysiol 54:123–133
Thomas RC, Wilson VJ (1965) Precise localization of Renshaw cells with a new marking technique. Nature 206:211–213
Wilson VJ (1988) The tonic neck reflex: spinal circuitry. In: Peterson BW, Richmond FJ (eds) Control of head movement. Oxford Press, New York, pp 100–107
Wilson VJ, Ezure K, Timerick SJB (1984) Tonic neck reflex of the decerebrate cat: response of spinal interneurons to natural stimulation of neck and vestibular receptors. J Neurophysiol 51:567–577
Wilson VJ, Schor RH, Suzuki I, Park BR (1986) Spatial organization of neck and vestibular reflexes acting on the forelimbs of the decerebrate cat. J Neurophysiol 55:514–526
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Yamagata, Y., Yates, B.J. & Wilson, V.J. Participation of Ia reciprocal inhibitory neurons in the spinal circuitry of the tonic neck reflex. Exp Brain Res 84, 461–464 (1991). https://doi.org/10.1007/BF00231470
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00231470