Abstract
The action potential of the lateral nerve of Carussius aurats was recorded by the cathode ray oscilloscope. The action potential showed two or more peaks, and the first of which was stronger. The conduction velocity of the first spike potential was 28.9 m/sec, and that of the second was 9.5 m/sec. The lateral nerve was consisted from at least two kinds of fiber groups, i. e. A and B. The nerve fibers which conduct the first spike potential belongs to A group, while the second belongs to B.
The lateral nerve contains more than 900 fibers of various diameter (25μ-1μ) . According to Erlanger and Gasser's assumption, which insists the proportionality between the conducting velocity and the cross area of fibers, we could assume the appearance of three peaks of action potential theoretically. The expeumeutal results fuvoured this theoreticul postulation.
