Maturation of spinal-evoked potentials to tibial and ulnar nerve stimulation in clinically normal dogs.
Spinal-evoked potentials were recorded from 2 litters of clinically normal mixed-breed dogs between 35 and 300 days of age. Summated responses to tibial nerve stimulation were recorded from percutaneous needle electrodes placed at L7-S1, L4-5, T13-L1, C7-T1, and the cisterna cerebellomedullaris. The ulnar nerve was stimulated with recordings at C7-T1 and the cisterna cerebellomedullaris. Amplitudes did not change significantly with age, but were significantly (P less than 0.05) different between various recording sites. On day 35, segmental and overall (L7-cisterna cerebellomedullaris) conduction velocities were less than half of the adult values. Spinal cord conduction velocities increased with age, reaching adult values at approximately 9 months of age. It was determined that quadratic equations best predicted the conduction velocities during maturation.
Steiss
J E
JE
Scott-Ritchey Laboratory, College of Veterinary Medicine, Auburn University, AL 36849-5525.
Wright
J C
JC
D000367:Age Factors; D000818:Animals; D004285:Dogs / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D008297:Male; D009431:Neural Conduction / Q000502:physiology; D011247:Pregnancy; D011930:Reaction Time; D013127:Spinal Nerves / Q000502:physiology*; D013979:Tibial Nerve / Q000502:physiology*; D014459:Ulnar Nerve / Q000502:physiology*