Abstract
Neurosecretory cell types 1–6 in the eyestalk of Carcinus maenas were staged for secretory activity in crabs showing a circatidal rhythm of locomotor activity induced by chilling. Cell type 5 alone showed increased secretion at expected periods of low locomotor activity, and is unique to Hanstrom's organ. Heat cautery of selected neurosecretory regions confirmed the importance of Hanström's organ in maintaining the rhythm, and suggests it as a site for the production of neural depressing hormone (NDH). In vitro culture of eyestalks indicated a cycle of secretion in cell type 5. Optic nerve section confirmed the role of neural links in control of the locomotor rhythm. The significance of these results and the combination of neural and endocrine control of rhythmicity are discussed.
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