[Characteristics of the response of the white rami communicantes to stimulation of different sections of the amygdaloid body].
Electrical responses in L2-L3 white rami to stimulation of cortico-medial, baso-lateral and central amygdaloid nuclei were studied in anesthetized and immobilized cats. The stimulation evoked a similar pattern of sympathetic discharge mostly consisting of a wave with a mean latency of 69.04 +/- 1.31 ms. No strict topographical location of sympatho-activating structures was found in different areas of the amygdala. In simultaneous recording of arterial BP and amygdalo-sympathetic discharges, 10-sec period of tetanic (100/sec) stimulation of the amygdalo led to a short-latency component facilitation or appearance, the late component of the amygdalo-sympathetic discharge being depressed. The duration of the latter inhibition corresponded to the period of the BP reaction and therefore was of a baroreceptor origin. Possible mechanisms of amygdaloid regulation of the activity of sympathetic preganglionic neurons are discussed.
D000679:Amygdala / Q000502:physiology*; D000818:Animals; D001794:Blood Pressure; D002415:Cats; D004558:Electric Stimulation; D005071:Evoked Potentials; D007034:Hypothalamus, Posterior / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013127:Spinal Nerves / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000502:physiology
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