Coupling of electrical activity from contralateral sinus glands.

Bursts of electrical activity recorded extracellularly from the sinus gland (SG) of the isopod, Oniscus asellus, occur synchronously in right and left SGs. Synchronization results from the electrical activity of two physiologically identifiable neurosecretory cell (NSC) types in one SG being coupled to the electrical activity of their respective contralateral counterparts. Furthermore, the coupling mechanism which serves to coordinate hormone release from contralateral SGs appears to differ for each of the two NSC types.