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Journal of Experimental Biology 39,243-250 (1962)
Published by Company of Biologists 1962

Pharyngeal Proprioceptors in the Dogfish Squalus Acanthias L

G. H. SATCHELL ¹ and H. K. WAY ²

¹ Department of Physiology, Otago Medical School, New Zealand; Department of Zoology, University of Adelaide, S. Australia
² Department of Physiology, Otago Medical School, New Zealand

1. The responses of mechanoreceptors present in the branchial process of Squalus acanthias have been studied oscillographically; unitary responses were obtained by subdivision of the post-trematic branch of the branchial nerve. The deflexion of the branchial processes was monitored with a mechano-transducer tube.

2. Slowly adapting mechanoreceptors of medium to high threshold were most frequently isolated; nerve discharges were readily evoked by deflexion of the processes. Some receptors continued firing as long as the process was deflected. The discharge consisted of a phasic and static component. In some receptors acceleration of discharge occurred as the process was deflected and again as it was returned to the neutral position.

3. Discharge rate was found to be linearly related to the logarithm of the stimulus amplitude. The discharge rate of the phasic component increased as the rate of stimulus onset increased.

4. The role of these receptors in the respiration of the dogfish is discussed and it is suggested that they may play a part in relating the rate of respiration to its amplitude.

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