THE EXCITABILITY OF THE TURTLE VENTRICLE DURING VAGUS STIMULATION

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Abstract
In turtles (9-10 in. Chelydra serpentina and 6-8 in. Chrysemys sp.) the brain and spinal cord were destroyed, the plastron removed, the vagi in the neck dissected out, the heart exposed, the vagi stimulated and the ventricular systoles recorded by the suspension method. No detectable change was produced either in the rheobase or in the chronaxie if the rate was controlled. Such changes as did occur were secondary to alterations in rate and not due to intrinsic nervous influence, sustaining the conclusion that the ventricle is not innervated by the vagus.

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