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Journal of Experimental Biology 99,363-368 (1982)
Published by Company of Biologists 1982

Do the Extraocular Muscles in the Carp Compensate for Eye Displacements Induced by Respiratory Movements?

P.J. W. JÜCH ¹

¹ State University of Groningen, Department of Zoology, P.O. Box 14, 9750 AA Haren, The Netherlands

The eyes in normally respiring carp are induced by elements of the respiratory pumping system to make small displacements in phase with the respiratory cycle. The ocular movements were studied by film analysis during the normal respiratory cycle and the cough. In the course of the movement, the optic axis remains nearly parallel to its starting position. This results in a smaller retinal image shift than would be produced by angular movements.

Electromyography of the extraocular muscles showed that the external rectus and superior oblique muscles contribute to image stabilization during strong respiration, and the external rectus and the superior oblique muscles contribute during the cough.