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Published on: February 20, 2011
Discharge pattern of the sympathetic vertebral nerve activity in kittens in postnatal ontogenesis
1Department of Normal Physiology and Biophysics, Yaroslavl State Medical Academy, Revoliucionnaya 5, Yaroslavl 150000, Russia. mpm@yma.ac.ru
Abstract:
Electrical activity of the sympathetic vertebral nerve (VN) was studied in kittens (0-180 days) using frequency domain analyzes. Rhythmical discharges in the studied nerve were observed from the moment of birth and correlated with cardiac (1.2-3 Hz) and respiratory frequency (0.15-0.7 Hz). Amplitude of discharges was minimal in newborn kittens and increased during ontogenesis. Relative spectral power was maximal at cardiac and respiratory frequencies in animals in all age groups. '10-Hz discharges' (8-12 Hz band) in the VN oscillations appeared only in animals older than 20 days of life. In accordance to their sympathetic nerve discharge, kittens become mature at 2 month of their life.
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