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Journal of Experimental Biology 51,171-179 (1969)
Published by Company of Biologists 1969

The Possible Role of the Supra-Oesophageal Ganglion in the Responses of Nephtys (Polychaeta, Annelida) to Changes in Hydrostatic Pressure

ELFED MORGAN ¹

¹ Department of Zoology and Comparative Physiology, University of Birmingham Birmingham, 15

1. The swimming activity of the isolated ‘tail’ region of Nephtys is not affected by changes in hydrostatic pressure. In contrast the responses shown by the isolated anterior third of the body are indistinguishable from those of intact worms.

2. Decerebration, or transection of both circum-oesophageal connectives, also destroys the worms' ability to respond, whereas transection of the connective on one side only does not.

3. Not one of the sensory structures hitherto described in association with the supra-oesophageal ganglion appears to be the sole mediator of the response.