Electrophysiological Investigations of the Heart of Squill a Mantis
نویسنده
چکیده
In most, possibly all, Crustacea the heart beat is neurogenic. Each beat is initiated by a burst of impulses from a small group of neurones whose cell bodies lie grouped in the ganglionic nerve trunk (g.n.t.) in the heart wall and whose axons run to the heart muscle. Many attempts have been made by electrophysiologists to discover how these neurones are integrated to fire rhythmic bursts (for example Maynard, 1953, 1955; Hagiwara & Bullock, 1957; Bullock & Terzuolo, 1957). However, apart from the study by Irisawa et al. (1962) of some aspects of heart muscle physiology in Squilla oratoria, analysis of the complete neuromuscular system of a crustacean heart does not appear to have been undertaken. In the present study such an analysis has been attempted in the case of the heart of the stomatopod, Squilla mantis. The relatively simple anatomical plan of the stomatopod heart makes it a more favourable preparation for electrophysiological study than is the heart of decapod Crustacea. The present paper describes the investigations made of the ganglionic nerve trunk of Squilla mantis. A second paper (Brown, 1964 a) will be concerned with the electrophysiological properties of the heart muscle of Squilla. In a third paper (Brown, 19646) the mode of action of extracts of the pericardial organs on the heart of Squilla will be considered in relation to the electrophysiology of untreated hearts.
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