Abstract
Electrical stimulation of various areas of the cockroach protocerebrum resulted in changes in the amount of neurosecretory products both in the neurosecretory cells and in the corpora cardiaca. Stimulating the neurosecretory cell area for various time intervals led to depletion of the neurosecretion from the neurosecretory system. Intracellular recordings showed the neurosecretory cells to have resting membrane potentials of 20 to 40 mV; depolarizations of 2 to 3 mV occurred spontaneously and could be modified by stimulating the corpora cardiaca. Depletion of the neurosecretory material from the corpora cardiaca was observed after depolarizing these organs for 30 min with isotonic saline solution having a potassium concentration fifty times that of normal cockroach saline. These findings support the implicit assumption that the neurosecretory cells of the brain have properties of neural cells as well as secretory cells, and that the neural and secretory activities are functionally related.
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