Electromyographic and Pressure Events in the Nasolaryngeal System of Dolphins during Sound Production
In electromyography fine wires are inserted into muscles to measure their activity periods. We have employed this technique to evaluate the activity of various muscles of the nasolaryngeal system of dolphins during the production of sounds. The anterior internus, the posterior internus, diagonal membrane muscle and the nasal plug muscle have been studied in greatest detail. These muscles fire just before and during the production of sounds whereas the hyoepi-glottal muscle and the intercostal muscles do not. Simultaneous video recordings of blowhole movement and electromyogram (EMG) have been made to correlate such movement with EMG and sound production.
KeywordsPressure Event Bottlenosed Dolphin Sound Production Intratracheal Pressure Inflated Balloon Catheter
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- Basmajian, J. V. and Stecko, G. A., 1962, A new bipolar indwelling electrode for electromyography, J. Appl. Physiol., 17:849.Google Scholar
- Basmajian, J. V., 1978, “Muscles Alive”, The Williams and Wilkins Company, Baltimore.Google Scholar
- Evans, W. E., and Prescott, J. H., 1962, Observations of the sound capabilities of the bottlenosed porpoise: a study of whistles and clicks, Zoologica, 47:121.Google Scholar
- Evans, W. E., and Maderson, P. F. A., 1973, Mechanisms of sound production in delphinid cetaceans: a review and some anatomical considerations, Am. Zool., 13:1205.Google Scholar
- Green, R. F., Ridgway, S. H., and Evans, W. E., Functional and descriptive anatomy of the bottlenosed dolphin nasolaryngeal system with special reference to the musculature associated with sound production, this volume.Google Scholar
- Gurevich, V. S., 1973, A roentgenological study of the respiratory tract in Delphinus delphis, (Russ. Eng. abstract), Zool. Zh., 52:786.Google Scholar
- Hollien, H., Hollien, P., Caldwell, D. K., and Caldwell, M. C., 1976, Sound production by the Atlantic bottlenosed dolphin, Tursiops truncatus, Cetology, 26:1.Google Scholar
- Lawrence, B., and Schevill, W. E., 1956, The functional anatomy of the delphinid nose, Mus. Comp. Zool. Bull., 114(4):103.Google Scholar
- Norris, K. S., Dormer, K. J., Pegg, J., and Liese, G. J., 1971, The mechanisms of sound production and air recycling in porpoises: a preliminary report, in: “Proc. 8th Annual Cong. Biol. Sonar and Diving Mammals”.Google Scholar
- Purves, P. E., 1967, Anatomical and experimental observations on the cetacean sonar system, in: “Animal Sonar Systems, Biology and Bionics”, R. G. Busnel, ed., Imprimerie Louis Jean, GAP (Hautes Alpes), France.Google Scholar
- Ridgway, S. H., 1979, Electrophysiological experiments on hearing in Odontocetes, this volume.Google Scholar
- Schenkkan, E. J., 1973, On the comparative anatomy and function of the nasal tract in Odontocetes (Mammalia, Cetacea), Bijdr. Dierk., 43:127.Google Scholar