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MedLine Citation:
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PMID: 19355263 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Industrial CT scanning technology was used to collect the first x-ray tomograms from the head of an adult male Cuvier's beaked whale. These scans and tissue property measurements were used to construct a finite element model. Simulations revealed pathways for sound propagation into and out of the head. One intriguing result concerns a newly described gular pathway by which sound reaches the hearing apparatus. Propagated sound waves enter the ventral aspect of the head and form an acoustic "river" that flows toward the bony ear complexes through the internal mandibular fat bodies. The precise pathway and dimensions of the sound river vary with frequency, but it converges on the bony tympanoperiotic complex. A combination of tissue structures and air spaces act like an internal acoustic pinna that filters and concentrates the incoming sound. The river of sound apparently functions in concert with the absence of the medial bony lamina of the posterior portion of the mandible, a condition that exists in all toothed whales and their ancestral archaeocetes. The gular pathway and river of sound suggests that this is the primordial pathway for underwater hearing in whales and that Norris' jaw hearing mechanism was a more recent development. |
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Authors:
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Ted W Cranford; Petr Krysl; John A Hildebrand |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 125 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-04-09 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 2677 Citation Subset: IM |
Affiliation:
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Biology Dept., San Diego State Univ., 2674 Russmar, San Diego, CA 92182Univ. of California at San Diego, La Jolla, CA 92093. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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