STUDIES ON ELECTROPHYSIOLOGICAL PROPERTIES OF VAGO-VAGAL REFLEX

Abstract

1. Electrical reflex response of vago-vagal reflex was studied by stimulating the cervical vagus nerve of the right side and recording from the cervical vagus nerve of the left side.
2. The electrical response of vago-vagal reflex can be grossely divided into three groups: constant 5-10 msec, latency response, labile 20-30 msec, and 60-90 msec. latency responses.
3. These reflex responses are abolished by myanesin.
4. Strychnine augments this reflex response and evokes the spontaneous burst-like discharge in higher doses.
5. The responsible afferent fibers of reflex response are probably the B and delta fibers.
6. Systemic cooling evokes the remarkable augmentation of vago-vagal reflex response.
7. Mechanism of “Irritation syndrome” is discussed in connection with these observations.