Mandible Bones Study of the Delphinus Delphus as an Element of the External Hearing Organ
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Abstract
The process of conducting acoustic signals to the inner ear of toothed cetaceans is one of the key questions of the device sonar of these animals, but so far researchers have no clear answer to it. The main role in conducting the high-frequency component of sound is assigned to the morphological structures of the lower jaw. It is believed that sound enters these structures through "acoustic Windows" - an area in the caudal parts of each half of the lower jaw. According to another version, the passage of sound begins in the rostral part through the chin channels. Until now, this issue has only been studied on the bones of the lower jaw of Tursiops truncatus. In this paper, similar data are obtained from the analysis of the morphology of the bones of Delphinus delphus.
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