PMID: 3762793Jan 1, 1986Paper

Functional characteristics and topography of spinal tracts involved in low- and high-threshold startle reflexes

Neir̆ofiziologiia = Neurophysiology
A P Gokin

Abstract

Electrophysiological and topographical properties of the spinal tract systems involved in two functional types of startle reflexes were studied in chloralose anesthetized cats: a high threshold reflex evoked by intense peripheral nerve stimulation (spino-bulbo-spinal, SBS, reflex) and low threshold evoked by tactile (T-reflex) and acoustic (A-reflex) stimulation. It was found that the mean maximal conduction velocity of descending transmission of SBS-reflexes was much less (30 m/s) than that of T- (85 m/s) and A-reflexes (100 m/s). Ascending conduction velocities for SBS- and T-reflexes were 70.8 and 40.2 m/s, respectively. It was established by partial spinal cord lesions that ascending tracts for T-reflex passed in dorsal and dorso-lateral funiculi; those for SBS reflexes were found not only in the latter but also in ventro-lateral and partially in ventral funiculi. Descending pathways for SBS reflex passed mainly in ventro-lateral funiculi and partially in the ventral ones. Descending pathways of T- and A-reflexes had a similar organization and were located mainly in the ventral and ventro-lateral funiculi. Functional organization of spinal tracts of all studied types of startle reflexes is discussed.

References

Jan 1, 1976·The Japanese Journal of Physiology·M ShimamuraY Igusa
Aug 17, 1979·Brain Research·M Shimamura, I Kogure
May 1, 1977·The Journal of Physiology·F CerveroV Molony
Jan 28, 1972·Brain Research·C G Wright, C D Barnes
May 1, 1982·The Journal of Comparative Neurology·L H HaberW D Willis

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Citations

Jan 1, 1989·Neir̆ofiziologiia = Neurophysiology·A P GokinIu P Limanskiĭ
Jan 1, 1991·Neir̆ofiziologiia = Neurophysiology·Iu E D'iachenko, N N Preobrazhenskiĭ

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