Spread of the dorsal root potentials in lower lumbar, sacral and upper caudal spinal cord

  title={Spread of the dorsal root potentials in lower lumbar, sacral and upper caudal spinal cord},
  author={K. Lupa and G. W{\'o}jcik and M. Oż{\'o}g and A. Niechaj},
  journal={Pfl{\"u}gers Archiv},
Spread of the dorsal root potentials (DRPs) along lower lumbar, sacral, and upper caudal segments of the cord has been studied in spinal cats. Ipsilateral DRPs produced by stimulation of L5 dorsal root with single volleys and recorded in consecutively more and more caudal segments gradually decrease and after passing 6 segments attain 47% of amplitude observed in L6 dorsal root. DRPs spreading cranially from Ca2 dorsal root along 6 segments decrease virtually to zero. Depolarizations spreading… Expand
Differential depression by apomorphine of the dorsal root potentials spreading caudally and cranially in the cat spinal cord
It is suggested that differences in the depression of the DRPs spreading caUDally and cranially result from different numbers of dopaminergic neurons terminating on interneurons transmitting depolarization cranially or caudally, respectively. Expand
Local and diffuse mechanisms of primary afferent depolarization and presynaptic inhibition in the rat spinal cord
  • M. Lidierth
  • Chemistry, Medicine
  • The Journal of physiology
  • 2006
Two types of dorsal root potential (DRP) were found in the spinal cord of urethane‐anaesthetized rats. Local DRPs with short latency‐to‐onset were evoked on roots close to the point of entry of anExpand
Distribution of bilateral dorsal root potentials evoked by volleys in afferents entering lumbar and sacral segments of the spinal cord
Ipsilateral dorsal root potentials evoked by volleys entering lumbar and sacral segments of the cord are largest at the level of entry of afferent volleys. Contralateral potentials resulting fromExpand
Temporal facilitation of depressor responses evoked by stimulation of A- and C-fibres in the aortic nerve.
Increase in number of volleys in A-or C-fibres in the aortic nerve produces rises of depressor responses which indicate temporal facilitation, which was studied in rabbits anaesthetized with urethane. Expand


Bilateral dorsal root potentials in the lower sacral spinal cord
The pattern of bilateral DRPs in the S3 segment significantly differs from that observed in the L7 segment and these differences correspond to the already known distinct arrangement of the substantia gelatinosa in the two parts of the cord. Expand
Spinal cord distribution of the somatic innervation of the external urethral sphincter of the cat.
Using retrograde degeneration, the motor neurons of the urethral branch of the pudendal nerve were located in the ventral part of the vents in the sacral spinal cord of the cat, indicating that afferents were distributed in approximately the same way as efferents. Expand
The physiology and anatomy of long ranging afferent fibres within the spinal cord.
The caudal extent of the terminal arborizations of dorsal root afferents was determined in adult cats. The method used micro‐electrode stimulation within the dorsal horn and the recording on aExpand
Distribution and Connections of Afferent Fibres in the Spinal Cord
Upon entering the spinal cord through the dorsolateral sulcus the dorsal root fibers penetrate into various depths along the dorsomedial border of the dorsal grey column, its length and orientation thus varies in different regions of the cord. Expand
The tract of Lissauer and the dorsal root potential.
1. Intersegmental dorsal root potentials (d.r.p.s) have been recorded in the lumbar spinal cord of spinalized cats under Na pentobarbitone anaesthesia, to investigate the spinal cord structuresExpand
Spinal cord organization of micturition reflex afferents.
Depression of the micturition reflex was displayed by antidromic stimulation of the pelvic detrusor motor nerve fibers and was evident contralaterally and ipsilaterally, consistent with proposal that mitzurition is a brain-stem reflex with final common pathway in caudal brain stem. Expand
This depolarization of the central terminals of the cutaneous fibres by afferent volleys from contralateral muscles resulted in a depression of synaptic activity of these cutaneous Fibres as evidenced by the flexor reflex, theCutaneous dorsal root potential and the afferent cutaneous tract discharge in the spinal cord. Expand
Dermatomes and skin innervation density in the cat's tail.
  • K. Reid
  • Biology, Medicine
  • Experimental neurology
  • 1970
Sacral and coccygeal dermatomes of the cat were mapped by recording action potentials evoked in small bundles of dorsal roots by mechanical stimulation of their cutaneous receptive fields and it was found that no sacral roots innervate the distal half of the tail. Expand
Central pathways responsible for depolarization of primary afferent fibres
It was concluded that the DRP and the P wave of the cord dorsum are produced by the same potential generator in the spinal cord, and this identification has been accepted by all subsequent investigators. Expand
Possible relationships between extracellular potassium activity and presynaptic inhibition in the spinal cord of the cat
The results indicate that factors other than a K+-increase are probably also involved in the process of presynaptic inhibition and an elevation in the potassium level may, however, contribute to the excitability increase in primary afferents. Expand